Nebula Cluster — Bespoke Cluster Crystal Pendant for Rooftop Bar

What is the Nebula Cluster and where is it specified?

At XHLWX (led-project-light.com), a Custom Indoor LED Lighting Manufacturer based in China, we specialise in transforming architectural visions into illuminated realities. The Nebula Cluster (Product Number: NEBULACLUSTERCRYSTALPENDANTROOFTOP) is a prime example of our bespoke capabilities. It is not a standard product but a custom-engineered lighting sculpture designed as a gravitational centrepiece for high-end hospitality and commercial spaces. Each fixture is an asymmetric arrangement of hand-blown smoked crystal globes, suspended by blackened brass-finished cables from a central canopy. The unique, organic form ensures that no two clusters are ever identical, providing an exclusive statement piece for luxury hotel atriums, rooftop bars, exclusive restaurants, and grand residential voids.

Photometric and electrical specification

Every Nebula Cluster is engineered to meet the specific technical and aesthetic demands of a project. The following table outlines the typical specification options available for specifiers in the EU, US, and Middle East.

Parameter	Specification	Standard	Notes
Optical - CCT	2200K / 2700K / 3000K	ANSI C78.377	Tunable white (2200-3000K) and other custom CCTs are available upon request. Warm CCTs are recommended for hospitality environments.
Optical - CRI/TM-30	Ra > 95, R9 > 80	CIE S 026 / IES TM-30-18	TM-30 metrics typically Rf > 90, Rg > 100. Essential for rendering skin tones, food, and beverages with high fidelity.
Optical - UGR	N/A - Decorative	EN 12464-1	This is a decorative, ambient fixture. Light is intentionally diffused through crystal to create atmosphere, not for task illumination where UGR is critical.
Light Source	Edison Filament / G9 / E14 / COB	Project-specific	Choice of source depends on desired aesthetic, from vintage Edison to high-performance COB. Lifespan is L70 > 50,000 hours.
Electrical - Efficacy	40-70 lm/W	Varies	Efficacy is dependent on CCT, light source type, and crystal density. Full photometric data provided with design.
Electrical - Driver	Tridonic / Mean Well / Osram	EN 61347	Remote drivers housed in the canopy or a service closet. Specified for DALI-2, 0-10V, TRIAC, DMX, or Casambi control protocols.
Housing - Material	Die-cast aluminium canopy, steel cables, hand-blown crystal	ISO 9001	Finishes (e.g., blackened brass, polished chrome, matte black) are fully customisable. Crystal globes are hand-blown and unique.
Housing - IP Rating	IP20	EN 60529	For indoor, dry locations only. Not suitable for bathrooms or outdoor areas.
Certification	CE, RoHS, ISO9001	Project-specific	UL / cUL listing is available upon request for projects in the USA and Canada.

Which spaces is it designed for?

The Nebula Cluster serves as a powerful visual anchor in large-volume spaces where design impact is paramount. It is specified by architects and lighting designers looking to create a memorable experience. Its primary applications are in the hospitality sector, including grand hotel lobbies, multi-story atriums, ballrooms, and exclusive dining areas. The fixture's scale and warm, inviting light make it particularly effective in creating intimacy within expansive environments.

How does the Nebula Cluster enhance a rooftop bar or lounge experience?

In a rooftop bar or premium lounge, atmosphere is everything. The Nebula Cluster, with its warm CCT options from 2200K to 2700K, generates a sophisticated and relaxing ambience. The smoked crystal globes diffuse the light, eliminating harsh glare and creating a soft, flattering illumination that encourages guests to linger. Its sculptural, Instagram-worthy presence becomes a talking point and a key feature of the venue's interior design, often integrated with DALI or DMX controls to subtly shift lighting scenes from sunset to late night.

What is the design process for a custom cluster in a hotel atrium?

The process is collaborative from start to finish. It begins with your architectural plans and concept sketches. Our engineering team then creates detailed 3D renderings of the Nebula Cluster within your space for scale and massing approval. Following this, we perform a complete DIALux simulation to visualise the lighting effect and confirm lux levels. We provide comprehensive structural drawings and electrical plans. For lighting designers, we supply full IES and LDT photometric files for each light source to integrate into the overall lighting scheme. A physical mock-up of a globe assembly can be produced for final approval before the 45-90 day fabrication period begins.

Can this fixture be specified for high-ceiling residential projects?

Yes, the Nebula Cluster is frequently scaled for luxury residential projects with double-height entryways, great rooms, or staircase voids. While the Ø2500mm x H2000mm example is for large commercial spaces, we can design a cluster of any dimension. For a U.S. residence, we would ensure the fixture is engineered for UL compliance and compatible with common home automation systems using 0-10V or TRIAC dimming drivers, providing a piece of functional art that is both safe and seamlessly integrated.

Installation, control and compliance (DALI-2 / Casambi / 0-10V, CE / RoHS / ErP)

Control is specified per project requirements. For sophisticated commercial projects in Europe and the US, we recommend DALI-2 for individual addressability and integration into building management systems. 0-10V dimming offers a robust and widely compatible analog solution. We can also integrate Casambi for wireless Bluetooth mesh control, ideal for retrofits or spaces where new control wiring is difficult. For dynamic applications, DMX control allows for full scene-setting capability. All our fixtures comply with European CE and RoHS directives. ErP compliance is achieved through the use of high-efficiency LED sources and premium drivers from manufacturers like Tridonic and Osram. For North American projects, UL listing is managed on a project-specific basis to ensure full compliance with local codes.

Customisation, MOQ and lead time

As a bespoke product, the Nebula Cluster is defined by its customisability. Every element can be tailored:

• Dimensions: Cluster diameter, overall drop height, and density.
• Crystal: Number of globes, individual globe size, and finish (e.g., smoked, clear, amber, frosted).
• Metalwork: Finish of the canopy, suspension system, and globe holders (e.g., blackened brass, polished chrome, matte white/black).
• Lighting: CCT, CRI, and choice of LED source (filament, COB, etc.).

The Minimum Order Quantity (MOQ) for a Nebula Cluster is 1 set.

The lead time for design, engineering, and fabrication typically ranges from 45 to 90 days, depending on the project's complexity, scale, and the client's approval timeline.

Frequently Asked Questions

Q: What is the typical power consumption for a large cluster?

A: Power consumption is project-specific. A large Ø2500mm cluster with 50-70 individual LED sources (e.g., 3W G9 LEDs per globe) might consume between 150W and 210W. We provide a full electrical load calculation during the design phase. The use of high-efficiency Osram or Tridonic drivers ensures optimal performance and a lifespan of over 50,000 hours.

Q: How much does the Nebula Cluster weigh and what support is needed?

A: Weight varies significantly with size. A 2.5-meter diameter cluster can weigh from 150 kg to over 300 kg. We provide detailed structural drawings with total weight and fixing point loads. The ceiling structure must be appropriately reinforced by a local contractor to support this load, and we specify heavy-duty suspension systems rated for at least 1.5x the total weight for safety.

Q: What is the warranty and what does it cover?

A: The Nebula Cluster comes with a comprehensive 5-year warranty. This covers the LED light sources, drivers (from brands like Mean Well or Tridonic), and structural components against manufacturing defects. Due to the hand-blown nature of the crystal, minor variations are not considered defects but are part of the unique character of the fixture.

Q: Can we get a sample of the crystal before ordering?

A: Absolutely. For qualified projects, we can provide a sample of the hand-blown smoked crystal globe and a finish sample of the metal components for a nominal fee, which is typically credited against the final project order. This allows you and your client to approve the material quality and aesthetic, ensuring it meets the project's requirements before committing to the full 45-90 day production.

Request IES files and a quotation

At XHLWX (led-project-light.com), a Custom Indoor LED Lighting Manufacturer based in China, our team of engineers and designers is ready to support your project from concept to completion. To begin the specification process for a Nebula Cluster, please contact us with your architectural drawings and design intent. We provide a complete service package, including 3D modelling, DIALux lighting simulations, and detailed quotations. Request the IES and LDT photometric files for the Nebula Cluster to integrate this stunning fixture into your next landmark project.