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A lighting spec sheet is a manufacturer’s technical document describing a luminaire’s performance, electrical requirements, dimensions, controls, environmental ratings, and ordering options. Also called a lighting specification sheet, luminaire spec sheet, or fixture cut sheet, it helps project teams evaluate a product before purchasing.

Manufacturers often publish one document for an entire product family. The highest lumen output, lowest wattage, and available control features may represent different configurations, so the complete model number is essential for an accurate review.

Key Takeaways

A useful spec sheet review connects manufacturer data to the fixture and configuration being ordered.

What should you check before approving an LED fixture?

    • Identify the complete catalog number and selected options before comparing performance.
    • Calculate lighting efficacy using delivered fixture lumens and total input watts from the same configuration.
    • Match voltage, controls, mounting, and environmental ratings to installation conditions.
    • Verify applicable safety certification and any required DLC qualification.
    • Review matching photometric files, installation instructions, rated-life assumptions, and warranty terms.

Why Are Lighting Spec Sheets Important?

Lighting spec sheets help designers, contractors, distributors, and facility managers identify product differences before they cause purchasing errors or installation delays. They provide a shared reference for checking whether proposed fixtures meet project requirements.

Each document in the specification package serves a distinct purpose:

Document

What it establishes

Lighting specification

Required performance, materials, installation, and acceptance criteria

Lighting fixture schedule

Fixture types and configurations assigned to the project

Manufacturer’s spec sheet

Published product characteristics and available options

How to Read a Lighting Spec Sheet

Start with the exact configuration, then evaluate light output, compatibility, installation requirements, and supporting documentation.

1. Identify the Exact Model and Ordering Configuration

Catalog number: Use the ordering matrix to select the output package, CCT, CRI, optics, voltage, driver, mounting, finish, and accessories.

Option restrictions: Check footnotes for incompatible combinations or separately ordered components. For field-selectable fixtures, document the intended wattage and CCT settings.

spec sheet page 3

Image Source: RAB Lighting

The LED fixture specification sheet featured above is provided by RAB Lighting for the A17-4T150 LED fixture. All product specifications, images, trademarks, and associated materials are the property of RAB Lighting and are used here for educational reference. View the original RAB Lighting A17-4T150 product page for complete product specifications and additional technical documentation.

2. Check Wattage, Delivered Lumens, and Lighting Efficacy

Wattage: Total input watts describe the complete fixture’s power consumption, including driver losses.

Delivered lumens: Use the light output leaving the assembled luminaire.

Nominal lumens: This term may describe a rounded output category or LED-engine output. Check the manufacturer’s definition. Engine output can exceed delivered fixture output because of optical losses and operating-temperature effects.

Lighting efficacy (lm/W) = delivered fixture lumens ÷ total input watts
Example: 12,000 lumens ÷ 80 watts = 150 lumens per watt

Compare values for the same configuration and test conditions. LED chip efficacy does not establish complete-fixture efficacy.

spec sheet pg 1 (1)

Image Source: RAB Lighting

The LED fixture specification sheet featured above is provided by RAB Lighting for the A17-4T150 LED fixture. All product specifications, images, trademarks, and associated materials are the property of RAB Lighting and are used here for educational reference. View the original RAB Lighting A17-4T150 product page for complete product specifications and additional technical documentation.

3. Verify Color Temperature (CCT) and Color Rendering (CRI)

Correlated color temperature: Lighting CCT describes the light’s color appearance in kelvin. For example, 3000K appears warmer than 4000K. It does not measure fixture heat or light output.

Color rendering index: Lighting CRI compares color rendering with a reference illuminant at a comparable color temperature. CRI 80 is common in general commercial specifications; 90 or higher is often selected for color-sensitive applications.

These metrics operate independently. A 3000K fixture and a 4000K fixture can both have a CRI of 90.

lighting design services

4. Evaluate Optics, Distribution, and Outdoor BUG Ratings

Distribution: Review beam angles, intensity diagrams, shielding, and distribution types. Equal lumen output does not guarantee equal coverage or glare performance.

BUG ratings: For outdoor fixtures, review Backlight, Uplight, and Glare ratings against project requirements. Local ordinances may limit these characteristics. A BUG rating alone does not establish DarkSky approval, which includes additional criteria.

Photometric files: Request the IES file matching the selected output and optics so the design team can evaluate the proposed layout.

5. Confirm Voltage, Power Factor, and THD

Voltage: Match the supply voltage to the driver’s input range. A 120–277V driver does not automatically support 347V or 480V.

Power factor: A common commercial specification target is at least 0.90.

Total harmonic distortion: Current THD below 20% is a common purchasing benchmark. Some projects specify below 10%; confirm the actual engineering or utility requirement.

Check the voltage, loading, and dimming conditions associated with these values. Also review input current, surge protection, and inrush-current data where relevant.

6. Verify Dimming and Control Compatibility

Control method: Identify whether the driver supports 0–10V, DALI, phase-cut, or another protocol.

Operating behavior: Confirm minimum dimming output, off behavior, wiring, sensors, and compatible controllers. “Dimmable” alone does not establish that the fixture will work with the specified system.

A driver mismatch can prevent daylight dimming or require replacement and rewiring.

7. Check Mounting, Dimensions, and Construction

Physical fit: Review length, width, depth, weight, ceiling openings, and maintenance clearance.

Mounting and accessories: Verify brackets, pole connections, suspension kits, and whether hardware is included.

Construction: Check housing materials and finishes against corrosion exposure and cleaning conditions. Consult installation instructions for details beyond the spec sheet.

spec sheet page 2 (1)

Image Source: RAB Lighting

The LED fixture specification sheet featured above is provided by RAB Lighting for the A17-4T150 LED fixture. All product specifications, images, trademarks, and associated materials are the property of RAB Lighting and are used here for educational reference. View the original RAB Lighting A17-4T150 product page for complete product specifications and additional technical documentation.

8. Match Location Ratings, IP Protection, and Operating Temperature

Damp locations: These involve moisture or condensation without direct water exposure, such as appropriately sheltered canopy areas.

Wet locations: This exposes fixtures to dripping, splashing, rain, or flowing water. A covered location can still require wet-location suitability if water reaches the equipment.

IP ratings: IP65 means dust-tight protection and resistance to water jets; IP66 addresses more powerful water jets. Neither automatically establishes suitability for hot, high-pressure, or chemical washdown. Verify the manufacturer’s application limits.

Operating temperature: Compare the published ambient range with conditions around the fixture. Drivers, sensors, and emergency batteries may have different limits.

Turn Lighting Specifications into Smarter Product Decisions

Understanding LED lighting spec sheets is an important step in selecting the right fixtures for a commercial project. From evaluating lumen output, efficacy, and color temperature to comparing electrical requirements, certifications, and performance ratings, accurate product specifications help ensure lighting systems meet design requirements, application needs, and long-term performance goals.

Explore our Design Assist & LED Lighting Specification Services to see how Stouch Lighting helps architects, engineers, contractors, and developers navigate fixture selection, evaluate manufacturer specifications, and develop lighting solutions tailored to their projects. Then, tell us about your lighting project and let our team help you identify the right products and specifications to meet your performance requirements, budget, and project timeline.

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9. Distinguish L70 Rated Life from Component Warranties

L70 rated life: L70 identifies lumen maintenance at 70% of initial output under stated conditions. A 50,000-hour L70 claim does not guarantee every component will function for 50,000 hours.

Warranty coverage: Review the separate terms for LEDs, drivers, sensors, and batteries. Check operating-hour limits, exclusions, labor coverage, and replacement procedures.

10. Verify Certifications and Supporting Documents

Product verification: Match certification records and qualification listings to the selected model; don't rely solely on logos on a family-level sheet.

Supporting documents: Obtain installation instructions, photometric data, control compatibility information, and warranty terms. Emergency, hazardous-location, or specialized industrial applications may require additional documentation.

Frequently Asked Questions

Is a lighting spec sheet the same as a cut sheet?

In commercial lighting, the terms are often used interchangeably. “Cut sheet” historically described a product page taken from a catalog for review or approval. Today, either term may refer to a manufacturer’s multi-page technical document; neither guarantees a particular level of detail.

What certifications should an LED fixture have, and how do UL Listed and DLC Listed differ?

UL Listed indicates evaluation to applicable safety requirements within the certification’s scope. ETL Listed provides another recognized safety-certification route. A certified driver alone does not establish certification of the complete fixture.

DLC qualification addresses applicable performance requirements, including efficacy and lighting quality. Many commercial utility rebate programs require qualifying products, but DLC listing does not guarantee an incentive. Verify the exact model and current program rules.

What is an IES file for a light fixture?

An IES file is a digital record of a fixture’s measured light distribution. Calculation software combines this data with mounting heights, fixture locations, geometry, and other assumptions to predict illumination. It describes an individual fixture’s distribution; it does not independently establish the lighting results for an entire site.

Get Help Reviewing Your LED Fixture Specifications

Stouch Lighting helps commercial project teams evaluate fixture options, coordinate product information, and resolve specification questions before procurement.

Bring your fixture schedule, project requirements, and proposed cut sheets to our team for assistance comparing configurations and identifying missing information.

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