Sacred Architectural Lighting Mock-Up Study for Jakarta Cathedral

Lighting within sacred architecture is not merely about visibility. It is about shaping spiritual atmosphere, emotional perception, and the relationship between human experience and sacred space.

With great enthusiasm in welcoming the Apostolic Visit of Pope Francis to Jakarta Cathedral in September 2024, Herwin Gunawan and ALTA Integra Lighting Design team contributed to enhancing the interior lighting quality of the historic cathedral through a series of architectural lighting mock-up studies.

The mock-up lighting study was developed to explore how different lighting strategies can influence visual hierarchy, contemplative ambience, architectural depth, and the perception of religious art and liturgical elements within the cathedral interior.

Rather than focusing solely on brightness, the study investigated how controlled contrast, color rendering quality, luminance balance, and focal illumination could create a more human-centered and spiritually immersive worship environment.

Through a series of lighting mock-ups and visual evaluations, the project examined how light can respectfully reveal the architectural richness, sacred symbolism, and emotional atmosphere of one of Indonesia’s most important religious heritage buildings.

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Altar Main Table

Michael Ho from ERCO Singapore assisting Jakarta Cathedral during the lighting mock-up process, testing luminaire positioning, beam angles, and lighting quality to evaluate architectural perception, visual comfort, and worship experience within the historic cathedral interior.

A comparative mock-up evaluation was conducted between the proposed ERCO lighting solution (left) and the existing lighting system (right). Using a professional spectrometer, the assessment measured illuminance (lux), correlated color temperature (CCT), and color rendering quality (CRI) to understand how different lighting technologies influence visual perception and worship experience.

The results showed that the ERCO lighting achieved a higher illuminance level (736 lux vs. 389 lux) while maintaining a warm color temperature and superior color rendering performance (CRI 90 vs. CRI 82). This improvement allows priest face expression, architectural details, religious artwork, and liturgical elements to be perceived more naturally and accurately.

Flicker measurements were conducted to compare the performance of the existing lighting system and the proposed ERCO lighting solution. Flicker is an important lighting quality parameter that can affect visual comfort, concentration, camera recording quality, and the overall worship experience.

The measurement results showed that the existing lighting system exhibited a 14.31% flicker level, while the proposed ERCO lighting achieved a significantly lower 7.44% flicker level, representing nearly a 48% reduction in flicker. This improvement contributes to a more stable visual environment, reducing the risk of visual fatigue and discomfort during extended worship activities.

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Tabernacle Lighting Mock Up

The comparison between the two lighting approaches demonstrates how lighting strategy significantly influences the visual perception, emotional atmosphere, and spiritual experience of the church tabernacle. Although both scenes illuminate the same sacred architectural object, the difference in lighting composition creates entirely different spatial qualities and emotional responses.

Existing Lighting - small spotlight create glare spot and exesive dart spot

Existing Tabernacle Lighting Strategy

Multiple Small Spotlights with Fragmented Illumination

The existing tabernacle is illuminated using multiple small spotlight sources with narrow beam distributions. While this strategy increases localized brightness, it also creates: excessive reflective glare, fragmented illumination, harsh bright-dark transitions, visual clutter, uneven brightness distribution and no focal points.

The multiple bright hotspots generate a visually busy environment where the eye continuously shifts between isolated illuminated areas rather than perceiving the altar composition as a unified sacred focal point. The lighting perception feels: overly contrasty, fragmented, visually loud and noisy, less calm and less spiritually immersive.

The narrow beam spotlights also create excessive dark pockets between illuminated surfaces, causing the sculptural narratives and architectural carvings to appear disconnected from one another. Although dramatic, the lighting lacks overall compositional harmony and reduces the contemplative quality expected within sacred architecture.

Mock Up Testing - Reveal Golden Color and Visual Hierarchy

Mock Up Tabernacle Lighting

Layered and Hierarchical Illumination

The mock up lighting strategy shifts toward a more integrated and layered composition with improved visual hierarchy and controlled luminance balance. The mock-up lighting creates a more refined and cohesive sacred atmosphere by revealing the natural golden warmth and material richness of the historic altar architecture.

This strategy creates: stronger visual hierarchy, better luminance balance, reduced glare perception, improved spatial continuity, greater visual depth, enhanced sacred atmosphere and reveal the golden color paint.

The crucifix becomes the primary spiritual focal point, while the surrounding relief sculptures and ornamental carvings remain visually connected without competing excessively for attention. The lighting perception now feels: more sacred and contemplative, more visually organized, richer in depth and texture, more emotionally immersive, calmer and more reverent

Rather than fragmented the tabernacle composition, the lighting now creates layered depth and gentle contrast that guide the eye naturally through the altar narrative. The result is a lighting environment that feels more harmonious, contemplative, and emotionally immersive while maintaining appropriate visual focus and reverence within the sacred space.

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Subject to Background Light Ratio

The lighting study explores how subject-to-background illumination ratio influences visual perception, emotional atmosphere, and spatial hierarchy within a sacred architectural environment.

Rather than relying solely on overall brightness, the design approach evaluates how controlled contrast between the subject and background can shape focus, depth perception, and human emotional response.

Subject to Background High Contrast Ratio

Stronger Focus and Dramatic Emphasis

In the high contrast lighting, the lighting composition applies a higher subject-to-background contrast ratio by reducing background illumination and increasing visual separation between the speaker and surrounding architecture.

This strategy creates:

• Stronger visual focus on the subject

• Greater sense of depth

• More dramatic atmosphere

• Reduced background distraction

• Enhanced subject prominence

Subject - Background Illumination Ratio - High Contrast

The darker background allows the human figure to emerge more clearly from the space, improving visual hierarchy and directing audience attention more intentionally toward the speaker. The lighting perception feels: More intimate, More cinematic, More emotionally focused, More visually dramatic and More contemplative.

This approach is particularly effective for: Camera-focused communication settings, Recorded presentations, Broadcast environments, Emotional or reflective moments and Dramatic or Contemplative Sermons storytelling,

Subject to Background Medium Contrast Ratio

Balanced Visibility and Spatial Integration

In Medium Contrast Ratio Lighting, the lighting composition applies a medium subject-to-background contrast ratio, where both the subject and altar background remain visibly connected within the visual field. This approach creates: Softer visual transition, Balanced spatial perception, Comfortable facial visibility, Natural skin tone rendering and Greater contextual awareness of the architectural background.

Subject - Background Illumination Ratio - Medium Contrast

The medium contrast ratio allows the speaker to remain visually dominant while maintaining the sacred altar as an important spatial backdrop. The lighting perception feels: Warm and approachable, Spatially balanced, Calm and conversational and Architecturally integrated.

This lighting condition is suitable for: Religious talks, Community interaction, Hybrid worship streaming, Educational or pastoral communication and Situations requiring both subject clarity and environmental context.

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Via Crucis Mural Paint by Theo Molkenboer

The lighting study demonstrates how color rendering quality and illumination level significantly influence the visual perception, emotional atmosphere, and artistic readability of the Via Crucis mural painting by Theo Molkenboer.

Rather than functioning solely as illumination, the lighting becomes a medium for revealing artistic detail, material color richness, and spiritual narrative within the sacred artwork.

Existing Lighting - Low Color Rendering Index - Low Lux Level

Existing Lighting Mural Painting

Low Color Rendering Index — Low Lux Level

The existing lighting condition produces limited visual clarity due to insufficient illumination level and poor color rendering quality.

The mural appears:

• Dim and visually compressed

• Lacking tonal separation

• Low in material richness

• Reduced in artistic legibility

• Flat in color perception

• Visually muted and less emotionally engaging

The low Color Rendering Index (CRI) reduces the ability of the lighting to accurately reveal the original pigments, textures, and chromatic nuances of the artwork.

As a result:

• Skin tones appear dull

• Warm color layers become muddy

• Fine artistic details are lost

• Depth and dimensionality are weakened

• The mural narrative becomes less visually expressive

The low lux level further diminishes the mural’s visual prominence within the sacred interior, causing the artwork to recede into darkness rather than serving as an important spiritual and artistic focal point.

The overall perception feels:

• Dark and visually subdued

• Less inviting

• Less emotionally immersive

• Less connected to the sacred storytelling intention of the artwork

Erco Mock Up Lighting - Higher Color Rendering Index - Higher Lux Level

Mock Up Lighting Mural Painting

Higher Color Rendering Index — Higher Lux Level

In the lower image, the improved lighting condition significantly enhances the visual and emotional perception of the mural through higher CRI illumination and increased, yet controlled, lux levels.

The lighting now reveals:

• Richer color fidelity

• Greater tonal separation

• Improved material texture

• Enhanced artistic detail

• Better visual hierarchy

• Stronger narrative readability

The higher CRI lighting restores the warmth and complexity of the original mural palette, allowing:

• Skin tones to appear more natural

• Gold and earth-tone pigments to emerge more vividly

• Fine brushwork and texture to become visible

• Visual depth and layering to feel more dimensional

The increased illumination level improves visibility while maintaining a warm and contemplative sacred atmosphere.

Rather than appearing flat or faded, the mural now becomes:

• More visually alive

• More emotionally engaging

• More spiritually expressive

• More architecturally integrated within the church interior

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Lighting Mock-Up on vault balcony

Lighting Projection Mock-Up for the Memorial Plaque in the Foyer of Jakarta Cathedral

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What is sacred architectural lighting concept?

The mock-up lighting study demonstrates that lighting quality within sacred architecture cannot be measured only by illumination level alone.

Different lighting strategies create fundamentally different perceptions of atmosphere, spirituality, emotional comfort, and architectural experience. Through careful control of luminance hierarchy, color rendering, contrast, and visual focus, lighting becomes more than technical illumination — it becomes an instrument for contemplation, reverence, and human connection.

For historic religious spaces such as Jakarta Cathedral, sensitive lighting design plays an important role in preserving not only architectural heritage, but also the emotional and spiritual qualities experienced by worshippers and visitors.

This study reflects a broader human-centered lighting approach where light is designed not to dominate the space, but to quietly support sacred atmosphere, visual comfort, and meaningful spiritual experience.

Project Information

• Project: Jakarta Cathedral Architectural Lighting

• Location: Jakarta, Indonesia

• Service: Sacred and Heritage Architectural Lighting Design

• Scope: Lighting Mock-Up, Visual Evaluation, Lighting Quality Assessment

• Consultant: Herwin Gunawan / ALTA Integra

• Year: 2024

Sacred Heritage Lighting Design Process Jakarta Cathedral Church

Lighting a historical place of worship requires a deep respect for historical architecture, religious liturgy, and structural preservation. This case study details the meticulous, data-driven lighting design process utilized to revitalize the interior of the iconic Neo-Gothic Jakarta Cathedral.

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Phase 1

Architectural Heritage Study

Liturgical Study

Existing Lighting Quality Assesment

Before introducing new fixtures, a comprehensive empirical audit of the existing lighting environment is mandatory to safeguard the building's heritage status.

Spectral & Illuminance Testing: Utilizing advanced diagnostic tools (such as UPRtek spectrometer technology), we mapped the ambient light levels and color rendering indices across the nave and sanctuary.

Data Findings: Initial assessments captured a baseline light level of 44.0 lux at the pew level, with highly uneven intensity distribution (ranging from 25% to 46% efficiency across different zones).

Identifying Deficiencies: The high contrast and dark voids in the upper vaults detracted from the cathedral's majestic Neo-Gothic verticality, while inadequate task lighting compromised the readability of liturgical texts.

Heritage Preservation Focus: High UV and heat-emitting legacy bulbs were flagged for replacement to protect centuries-old woodwork, paintings, and sacred artifacts from photochemical degradation.

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Phase 2

Conceptual Lighting Design

3D Lighting Simulation & Digital Twin Mapping

To guarantee structural safety and visual accuracy before any physical installation begins, a digital twin of the Jakarta Cathedral was engineered.

Quantitative False-Color Analysis

Using specialized lighting simulation software, the cathedral's interior was modeled to calculate exact lux distribution, glare ratings, and surface reflectance. The false-color rendering allows stakeholders to visualize precisely how light behaves along the complex ribbed vaults and pointed arches.

Qualitative Material Rendering

Simultaneously, a 3D gray-scale rendering was generated to study the interplay of light and shadow (chiaroscuro), ensuring the architectural integrity and depth of the stone and timber pillars are enhanced, not flattened, by the new scheme.

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Phase 3

Conceptual 2D Wireframe

Structural Integration

A core challenge of heritage conservation is hiding modern technology within historic architecture without altering the physical fabric of the building.

• Non-Invasive Luminaire Placement: The 2D wireframe schematic illustrates the precise positioning of architectural uplights nestled into the capitals of the columns.

• Accentuating the Architecture: By grazing the faces of the pointed arches with warm, directional light, the design draws the eyes upward, celebrating the structural engineering of the cathedral.

• Reversible Design Principle: In adherence to strict international conservation standards, all lighting mounts and pathways are designed to be completely reversible, leaving zero permanent damage to the historic brick and stone.

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Phase 4

The Final Ambiance

Harmonizing Liturgy and Light

The ultimate goal of the design is to foster a serene, contemplative atmosphere that elevates the spiritual experience for the congregation.

Layered Lighting Scheme:

Ambient Layer: Soft, warm-toned illumination reflecting off the ceiling vaults to provide comfortable, glare-free general lighting.

Accent Layer: High-CRI (Color Rendering Index) directional spotlights dedicated to the Stations of the Cross, altars, and sacred oil paintings, bringing out their true colors and textures.

Task Layer: Focused, dimmable illumination targeted precisely at the pews and sanctuary for reading scripts and hymnals.

Smart Liturgical Control: The entire system is integrated into a digital control framework, allowing church staff to transition effortlessly between various scenes—ranging from intimate daily masses to brightly illuminated festive celebrations like Christmas and Easter.

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Project Information

• Project: Jakarta Cathedral Architectural Lighting

• Location: Jakarta, Indonesia

• Service: Sacred and Heritage Architectural Lighting Design

• Scope: Lighting Mock-Up, Visual Evaluation, Lighting Quality Assessment

• Consultant: Herwin Gunawan / ALTA Integra

• Year: 2024

Color as a Communication Medium: Facade Lighting Design Testing for Jakarta Cathedral

Project Overview

As one of Jakarta's most recognizable heritage landmarks, Jakarta Cathedral has been an integral part of the city's history since the Dutch colonial period. The cathedral stands not only as a place of worship, but also as a living witness to the social, cultural, and architectural evolution of Indonesia's capital.

Over the decades, the cathedral has become a powerful symbol of religious harmony, demonstrating how faith, culture, and community can coexist within a diverse urban society. Its presence within Jakarta's historic civic district continues to contribute to the city's cultural identity and collective memory.

To preserve this legacy, Jakarta Cathedral remains committed to the continuous conservation and enhancement of its architectural environment. These efforts ensure that the cathedral continues to serve both as a treasured heritage building and as a vibrant spiritual home for the Catholic community in Jakarta.

One of these efforts is exploring how Jakarta Cathedral tells its story at night through architectural lighting. Architectural lighting is often perceived as a tool for visibility and aesthetics. However, within civic, cultural, and religious architecture, light can serve a much broader role—as a medium of communication.

“Cultural and historical heritage is an irreplaceable and invaluable treasure. It represents an essential legacy for local communities, nations, and all humankind, connecting past generations with the present and future.”

— UNESCO - World Heritage Convention

The facade lighting color testing study for Jakarta Cathedral was developed to explore how different lighting colors influence public perception, emotional atmosphere, symbolic meaning, and the cathedral's relationship with the city at night.

As one of Indonesia's most important religious and cultural landmarks, Jakarta Cathedral regularly hosts major liturgical celebrations, national commemorations, interfaith events, and international visits. The project investigated how facade lighting could provide the flexibility to communicate these different occasions while preserving the dignity, heritage value, and sacred character of the cathedral.

Rather than viewing color-changing lighting as a decorative feature, the study approached color as a visual language capable of expressing identity, celebration, remembrance, solidarity, and spirituality.

Architectural lighting is not merely about illumination. Color becomes a visual language capable of communicating meaning, celebration, remembrance, spirituality, and cultural identity.

The facade lighting color testing for Jakarta Cathedral explored how different colors influence public perception, emotional response, and the symbolic expression of one of Indonesia's most important religious landmarks.

The study investigated how lighting could support:

• Religious celebrations

• Liturgical seasons

• National commemorations

• Cultural events

• Interfaith harmony initiatives

• Special ceremonial occasions

without compromising the dignity and heritage value of the cathedral.

Building Facade Contour, Light and Shadow Near Sunset

The Challenge

Historic religious buildings carry a unique responsibility within the urban environment.

Unlike commercial buildings, where dynamic lighting is often used for branding and attraction, heritage religious architecture requires a more sensitive approach. Every lighting intervention must respect the building's architectural integrity, cultural significance, and spiritual atmosphere.

The primary challenge was balancing:

• Heritage conservation principles

• Architectural authenticity

• Sacred identity

• Public communication needs

• Nighttime landmark visibility

• Environmental responsibility

The project also needed to address an important question:

How can a historic cathedral communicate different messages and ceremonial occasions through light without compromising its timeless architectural character?

The design team recognized that color has the ability to evoke emotional responses and symbolic meanings. However, excessive use of color or inappropriate lighting compositions could easily diminish the solemnity and dignity expected from a sacred landmark.

The testing process therefore focused on identifying lighting approaches that could enrich communication while maintaining respect for the cathedral's religious significance.

Building Facade Contour Analysis, Lighting Position Testing, and the Perception of Light and Shadow

Our Approach

In developing the nighttime lighting strategy, we first studied how the architectural contours, proportions, and visual hierarchy of the cathedral are perceived during daylight conditions. Understanding the building's form in natural light allowed us to identify the key architectural elements that define its character and historical significance.

We then conducted a series of lighting models and simulations, evaluating various illumination levels, light quality, color compositions, fixture locations, and beam angles. These simulations enabled us to assess how different lighting approaches would interact with the cathedral's Neo-Gothic architecture and influence its nighttime identity.

Through this process, we analyzed how the balance between light and shadow could reveal the building's contours, architectural details, and vertical expression. Rather than simply making the cathedral brighter, the objective was to create a visual composition that communicates peace, dignity, grandeur, and a sense of wonder—allowing visitors to appreciate both the spiritual presence and the rich historical legacy of one of Indonesia's most important religious landmarks.

The study explored a series of facade lighting color scenarios to understand how different lighting compositions influence architectural perception and emotional response. Rather than evaluating color purely from an aesthetic perspective, the testing examined:

• Symbolic meaning

• Cultural associations

• Religious significance

• Emotional perception

• Architectural readability

• Nighttime urban identity

Multiple lighting scenarios were developed and visually assessed to understand how the cathedral's Neo-Gothic architectural features responded to different color palettes. Particular attention was given to preserving:

• Architectural detail visibility

• Material authenticity

• Visual hierarchy

• Building proportions

• Sacred atmosphere

The testing process allowed stakeholders to compare how different colors transform the perception of the same building while maintaining a coherent architectural identity.

Color: Liturgical Meaning and Emotional Perception

The project adopted a human-centered lighting philosophy that recognizes that people do not simply see color—they emotionally interpret it. Different colors can communicate different messages and create distinct emotional experiences.

Warm White

Warm white lighting reinforces the cathedral's timeless elegance and architectural authenticity while creating a sense of spiritual calmness and visual comfort. By revealing the building in a manner that closely reflects its natural appearance and material character, this lighting approach supports the everyday worship atmosphere and presents the cathedral in its most historically respectful and enduring form.

Gold and Amber

Golden and amber lighting tones communicate a sense of celebration, joy, and religious festivity while enhancing the cathedral's monumental presence and spiritual warmth. These colors create a welcoming and uplifting atmosphere that highlights the significance of special occasions, making them particularly suitable for major religious celebrations, festive seasons, and important ceremonial events.

Green

Green carries rich symbolic meaning within both Christian tradition and human perception, representing hope, renewal, growth, and spiritual vitality. In the Catholic liturgical calendar, green is associated with Ordinary Time, symbolizing perseverance in faith, ongoing spiritual growth, and the everyday journey of Christian life. Emotionally, green evokes a sense of harmony, balance, peace, and connection with nature, creating a welcoming and restorative atmosphere.

Blue

Blue lighting evokes a sense of peace, reflection, contemplation, hope, and serenity, creating a calm and introspective atmosphere around the cathedral. Its gentle and tranquil character encourages moments of personal reflection and spiritual connection, making it particularly effective for occasions that call for remembrance, prayer, unity, and emotional calmness.

Purple

Purple carries deep liturgical significance within the Catholic tradition and is closely associated with the seasons of Advent and Lent. The color symbolizes spiritual preparation, reflection, and repentance, encouraging a period of introspection and renewal. When applied to the cathedral facade, purple lighting creates a solemn and contemplative atmosphere that reflects the spiritual journey of faith, anticipation, and personal transformation.

Red

Red carries profound symbolic meaning within the Catholic tradition, representing the Holy Spirit, martyrdom, courage, and passion. The color is often associated with significant religious celebrations and solemn commemorations, conveying a sense of spiritual strength, sacrifice, and devotion. When applied to the cathedral facade, red lighting creates a powerful and emotionally resonant presence that reflects both the vitality of faith and the enduring legacy of those who have courageously borne witness to it.

By understanding these emotional and symbolic associations, lighting becomes a communication tool that supports meaningful human experience rather than merely changing visual appearance.

Heritage Conservation and Technical Integration

Beyond designing visual beauty, symbolic meaning, and emotional perception, the lighting strategy also had to respect the principles of heritage conservation and long-term building preservation.

As a designated heritage building, any lighting intervention must minimize physical impact on the historic structure. The installation of luminaires, cabling, mounting brackets, and supporting infrastructure was therefore carefully coordinated to comply with conservation guidelines. Particular attention was given to avoiding invasive installation methods, such as drilling or creating new openings in the historic fabric, which could potentially compromise the building's integrity or cause irreversible damage in the future.

The placement of lighting fixtures was also carefully evaluated to prevent excessive heat accumulation near sensitive architectural elements. Improper fixture positioning can trap heat and accelerate the deterioration of historic materials over time. Therefore, thermal considerations formed an important part of the design evaluation process.

Environmental sustainability was equally important. The lighting strategy prioritized energy-efficient light sources while carefully controlling brightness levels and light distribution to minimize unnecessary light spill and light pollution. This approach ensures that the cathedral remains visually prominent within the nighttime cityscape while maintaining environmental responsibility and preserving the dignity of one of Indonesia's most significant cultural heritage landmarks.

This integrated methodology demonstrates how architectural lighting can simultaneously support heritage conservation, environmental sustainability, technical performance, and meaningful nighttime storytelling. The project required the integration of architecture, heritage conservation, lighting technology, and cultural symbolism.

Special attention was given to ensuring that dynamic lighting scenarios remained subordinate to the architecture itself. The objective was not to transform the cathedral into a digital display, but to allow light to respectfully complement the building's architectural expression and ceremonial role. This approach ensures that the lighting enhances communication while preserving the cathedral's identity as a sacred and historic landmark.

Outcome

The color testing study demonstrated that facade lighting can serve as a powerful communication medium within heritage architecture.

Different lighting colors create different perceptions, emotions, and symbolic meanings while influencing how people connect with the building and the events it represents.

The project established a framework for future lighting scenarios capable of supporting:

• Religious celebrations

• Liturgical seasons

• National commemorations

• Interfaith solidarity events

• International visits

• Cultural celebrations

• Civic recognition programs

Most importantly, the study demonstrated that dynamic lighting can coexist with heritage conservation when guided by thoughtful design principles and respect for architectural identity.

The Jakarta Cathedral facade lighting color testing project illustrates how light can become more than illumination—it can become a meaningful language that connects architecture, culture, faith, and community within the nighttime cityscape.

ALTA Integra is a Building Science and Technology consultancy dedicated to creating human-centered environments through evidence-based design. By studying the relationship between light, sound, space, technology, and human emotion, we help transform buildings into places that inspire wellbeing, strengthen identity, and support a more sustainable future.

Every building has a story to tell. Through thoughtful architectural lighting design, we help reveal that story—enhancing heritage, enriching human experience, and creating meaningful connections between architecture, culture, and community. Visit our lighting design service page to discover how lighting can bring new life and meaning to your project after dark.

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Facade Lighting Design: Jakarta Cathedral Church

“Friendship is the hardest thing in the world to explain. It’s not something you learn in school. But if you haven’t learned the meaning of friendship, you really haven’t learned anything”

— Muhammad ALI

In preparation for the inauguration of “Terowongan Silaturahmi”, ALTA Integra has redesigned new facade lighting for this beautiful Neo-Gothic Church. “Terowongan Silaturahmi” underpass will connect Jakarta Cathedral Church and Istiqlal Grand Mosque Jakarta. This underpass will be the symbol of friendship between two big religions in the world.

The basic idea of the lighting concept is to relight Saint Mary's Cathedral Church to its original splendor. This relighting project is a part of The Saint Mary Cathedral Jakarta Restoration Project, which ALTA Integra was chosen to be the lighting designer of the restoration project of One Jakarta's Most Iconic Landmarks.

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Before

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Architectural & Electro Acoustic Design: Jakarta Cathedral Church

How We Improve Speech Intelligibility in Reverberant Acoustics Environment While Preserve Historical Beauty

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