The Complete Lighting Specification Checklist for Projects

Why proper specification matters

Lighting is one of the most value-engineered elements of any project. When a contractor substitutes a "similar" fixture from a cheaper supplier, the drawings may look the same but the resulting light quality can be dramatically different.

A robust specification is your defense. It defines exactly what is required, why it is required, and how compliance will be verified. When done properly, it prevents substitution of inferior products and ensures the final installed lighting matches the design intent.

This checklist covers every critical parameter that should be specified for architectural lighting fixtures. Use it to evaluate product submissions, compare alternatives, and write performance specifications.

Photometric and optical data

Photometric data is the single most important part of a lighting specification. Without it, you are specifying based on marketing materials rather than engineering data.

Always request IES files and verify them in DIALux or AGi32 before approving a product. Photometric data from the manufacturer should match real-world performance. If it looks too good to be true, it probably is.

Color quality and consistency

Color is where cheap products are most obviously inferior. Two "3000K" fixtures from different manufacturers can look dramatically different.

For projects with large quantities of fixtures, specify 3-step MacAdam ellipse as a minimum. 1-step is available for the most demanding applications. Anything above 5-step will have visible color variation between adjacent fixtures.

Electrical and control

Electrical compatibility is a common source of problems on site. Always verify driver and control compatibility before finalizing specification.

• Dimming protocol. 0-10V, DALI, DMX, TRIAC, or DALI-2? Specify exactly and ensure drivers are certified.
• Dimming range. What is the minimum dimming level? 1%? 5%? 10%? Flicker at low levels is a common complaint.
• Dimming curve. Linear, logarithmic, or square law? The curve must match the control system expectations.
• Driver type. Constant current or constant voltage? Integrated or remote?
• Power factor. ≥ 0.9 is standard for commercial projects.
• THD. Total Harmonic Distortion — should be < 20%.
• Inrush current. Important for circuit breaker sizing, especially with many fixtures on one circuit.
• Flicker. IEEE 1789 compliant, no visible flicker at any dimming level.

Mechanical and thermal

The mechanical design of a fixture directly affects its lifespan and performance. Heat is the enemy of LEDs — poor thermal management means rapid lumen depreciation and color shift.

• Housing material. Die-cast aluminum is standard for good heat dissipation. Plastic housings are a red flag for architectural grade.
• Thermal management. Active (heatsink only) or passive? What is the junction temperature at rated output?
• Ingress protection. IP rating appropriate for the location. IP20 for interior dry, IP44 for bathrooms, IP65+ for exterior.
• Mounting options. Recessed, surface, suspended, track? Are all required accessories available?
• Adjustability. For adjustable downlights, what is the tilt range? Is rotation 360°?
• Weight. Important for ceiling structure and installation method.
• Finish options. Are the specified finishes standard or custom? What is the lead time for custom?

Certification and compliance

For projects in Saudi Arabia and the GCC, certification is not optional — it is required for project approval.

Always verify that certifications are current and cover the specific model being specified. Some manufacturers hold certificates for one model and apply them to an entire product line — this will not pass inspection.

Warranty and support

Warranty is not just about replacing failed fixtures. It is about the manufacturer standing behind their product and supporting the project through installation and commissioning.

• Warranty period. 3 years minimum for commercial grade, 5 years for specification grade.
• What is covered. Fixture only? Driver included? Labor for replacement?
• Lumen maintenance warranty. L70 at 50,000 hours? At what ambient temperature?
• Color warranty. Will the manufacturer replace fixtures that shift outside specified color bins?
• Local support. Is there a local representative or is support international only?
• Spare parts availability. How long will replacement parts be available after the product is discontinued?
• Technical support during installation. Will the supplier provide on-site support for commissioning?

The pre-installation mockup

No specification is complete without a mockup. Even with perfect photometric data and all the right certifications, you cannot fully predict how a fixture will look in the actual space until you see it installed.

For any significant project, insist on:

• An on-site mockup of key fixture types in actual ceiling conditions
• Verification of beam spread, color temperature, and glare
• Comparison of multiple alternatives if substitutions are proposed
• Sign-off by the architect, lighting designer, and client before full production

Mockups add a small amount of time and cost upfront. They save enormous amounts of time, cost, and disappointment later.

At Yakeen, we provide complete specification packages for all our products — IES files, datasheets, certification documents, and full technical support. We also support on-site mockups and DIALux calculations to ensure our fixtures perform exactly as specified.