Calculating led downlight housing requirements for a large project starts with the room count. A 500-room hotel needs 6,000 downlights. A shopping mall needs 3,200. Get the housing quantity, model mix, and order schedule wrong, and you’ll face mismatched batches, delayed phases, and budget overruns. Here’s how to calculate it right.
Small orders (100–500 units) are simple: pick a model, place the order, receive shipment. Large projects (2,000+ units across multiple areas and specifications) introduce complexity that requires systematic planning:
Start with the architect’s or lighting designer’s schedule. For each area, document:
| Parameter | Example (Hotel Project) |
|---|---|
| Area name | Guest room, corridor, lobby, restaurant, spa |
| Downlight type per area | Standard recessed, deep anti-glare, surface-mounted |
| COB power per area | 12W (guest rooms), 20W (corridors), 30W (lobby) |
| Cutout size per area | 75mm (guest rooms), 75mm (corridors), 105mm (lobby) |
| Quantity per area | 800, 1,200, 400, 300, 300 |
| Beam angle per area | 36° (rooms), 55° (corridors), 24° (lobby accents) |
This gives you the model-to-area mapping — which ECOLEDKIT model goes where.
Using the area schedule, select the appropriate ECOLEDKIT model for each specification:
| Requirement | ECOLEDKIT Model | Rationale |
|---|---|---|
| 75mm cutout, 12W, standard recessed, 36° | 6101 (55-105mm cutout, 9-25W) | Covers the spec with margin |
| 75mm cutout, 20W, standard recessed, 55° | 6101 (same model, different lens) | Same housing, swap lens |
| 105mm cutout, 30W, deep anti-glare, 24° | 6208 (55-125mm cutout, 7-60W) | Deep anti-glare + wide power range |
| Surface-mounted, 75mm face, 12W | 6105 (45-95mm face, 5-15W) | Only surface-mounted model |
Tip: When possible, consolidate to fewer model numbers. Ordering 2,000 units of one model is cheaper and faster than ordering 500 each of four different models. The ECOLEDKIT 6101, for example, covers cutouts from 55–105mm and power from 9–25W — potentially serving both guest room and corridor requirements with a single model.
Never order the exact quantity from the lighting schedule. Add margins for three scenarios:
| Margin Type | Recommended Addition | Purpose |
|---|---|---|
| Installation damage | +3–5% | Covers units dropped, scratched, or incorrectly cut during installation |
| Post-handover replacements | +2–3% | Spare units for the client’s maintenance stock |
| Production variation | +1–2% | Covers any units that fail QC at your assembly facility |
Total recommended margin: 5–10% depending on installation complexity.
For the hotel example (3,000 total units), order 3,150–3,300 units.
Order Quantity = Sum of Area Quantities × (1 + Damage Rate + Replacement Rate + Variation Rate)
Example:
Guest rooms: 800 × 1.05 = 840Corridors: 1,200 × 1.05 = 1,260 Lobby: 400 × 1.08 = 432 (higher margin for complex anti-glare installation) Restaurant: 300 × 1.05 = 315 Spa: 300 × 1.05 = 315 ───── Total Order: 3,162
Large projects typically have multiple construction phases. Matching delivery to installation schedule reduces warehousing costs and cash flow pressure.
| Phase | Areas | Quantity | Delivery Date | Lead Time |
|---|---|---|---|---|
| Phase 1 | Guest rooms (floors 1–5) | 400 | Week 8 | Order by Week 5 |
| Phase 2 | Guest rooms (floors 6–10) | 400 | Week 12 | Order by Week 9 |
| Phase 3 | Corridors (all floors) | 1,200 | Week 14 | Order by Week 11 |
| Phase 4 | Public areas (lobby, restaurant, spa) | 1,000 | Week 16 | Order by Week 13 |
ECOLEDKIT’s standard production lead time is 15–25 working days for production orders. For in-stock models, 3 working days. Plan your orders at least 4 weeks before each phase’s installation start date.
When ordering in phases, request that all housings in the same project be produced from the same production batch (same die-casting lot, same surface treatment batch). This ensures consistent color and finish across the entire project — even if units are delivered months apart.
ECOLEDKIT can accommodate this by:
| Cost Component | Calculation | Example (3,162 units) |
|---|---|---|
| Housing unit price | Per model, based on quantity tier | Contact ECOLEDKIT for project pricing |
| Lens (included in kit) | No separate cost | Included |
| Spring clips / mounting hardware | No separate cost | Included in kit |
| Custom color surcharge (if applicable) | Per model, for non-standard colors | +10–15% per unit |
| Cost Component | Typical Range | Notes |
|---|---|---|
| International shipping (sea) | 8–15% of FOB value | LCL or FCL depending on volume |
| Import duties (varies by country) | 3–10% of CIF value | Housing kits typically lower duty than complete luminaires |
| Customs clearance | $200–500 per shipment | Broker fees |
| Warehouse storage (if phased) | $0.50–2.00/unit/month | Only if you receive all units at once |
Landed Cost = (Unit Price × Quantity) + Shipping + Duties + Clearance + Storage
For a rough estimate, multiply FOB price by 1.15–1.25 to get CIF + duties landed cost for most Asian-to-global trade routes.
Ordering exactly 3,000 units for a 3,000-unit project guarantees a shortage. Installers damage 3–5% during ceiling cutout and mounting. Without spares, you’ll need to place a rush order for 50–150 additional units — at a higher unit price and with express shipping costs.
Specifying four different models when one model covers all requirements increases procurement complexity, MOQ challenges, and lead time coordination. Before finalizing the order, review whether fewer ECOLEDKIT models can serve multiple areas.
Housings, drivers, and COB modules must all arrive at your assembly facility before luminaire production can begin. If housings arrive on time but drivers are delayed two weeks, you have warehousing costs without production output. Coordinate all three procurement timelines simultaneously.
After project handover, the building owner will need replacement units for years to come. Include 2–3% extra units in the original order and deliver them as “maintenance spares” — this costs far less than ordering a small batch years later when the model may have been discontinued.
ECOLEDKIT supports large projects with:
Contact sales@ecoledkit.com with your project specifications for a tailored quotation and delivery plan.
1. Wikimedia Foundation. “Recessed light.” Wikipedia. https://en.wikipedia.org/wiki/Recessed_light
2. Wikimedia Foundation. “Luminous flux.” Wikipedia. https://en.wikipedia.org/wiki/Luminous_flux
This article is published by ECOLEDKIT — professional COB LED downlight housing kit manufacturer, Zhongshan, China. A modular housing range, 100+ variants, IP20 indoor rated. Contact sales@ecoledkit.com for project pricing and phased delivery planning.
Related reading: import duty on LED downlights.
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