FMVSS 108: Standard for Automotive Lighting & Reflective Device Testing

Standard: FMVSS 108 – Federal Motor Vehicle Safety Standard for Lamps, Reflective Devices, and Associated Equipment

Certification Required: Compliance with FMVSS 108 is mandatory for all automotive lighting and reflective components sold in the United States. Manufacturers must ensure that their products meet stringent photometric and performance criteria as specified by the standard and certified by the National Highway Traffic Safety Administration (NHTSA). To demonstrate compliance, manufacturers need to provide reasonable care documentation. This typically includes test results, quality control processes, and proof that production units meet the same standard as tested samples.

Scope: FMVSS 108 defines the performance and photometric requirements for a wide range of automotive lighting systems and reflective devices. The standard ensures that vehicles are equipped with lighting that delivers proper illumination, visibility, and color consistency in various driving conditions. It encompasses tests for luminous intensity, beam pattern, effective projected luminous lens area (EPLLA), and other critical performance parameters.

Applicable Products: FMVSS 108 applies to a broad array of automotive lighting components and reflective devices, including:

• Headlamps: Both sealed beam and replaceable bulb types
• Tail Lamps & Brake Lights: Ensuring clear and visible signaling
• Turn Signal Lamps: Front and rear units that meet specific photometric requirements
• Daytime Running Lamps (DRLs): For enhanced daytime visibility
• License Plate Lamps: Illuminating the license plate uniformly
• Side Marker Lamps: Providing lateral visibility
• Backup Lamps & Other Reflective Devices: Enhancing overall vehicle conspicuity

Test Procedure: In our state-of-the-art photometric testing lab, each product is mounted in a custom test fixture that replicates its real-world installation. The procedure includes:

• Photometric Measurements: Evaluating the distribution and intensity of light across defined test points to verify compliance with FMVSS 108
• Beam Pattern Analysis: Testing both low and high beam functions (where applicable) to ensure proper illumination and glare control
• Color and Intensity Verification: Confirming that the light output meets the required color consistency and brightness levels
• Environmental & Durability Testing: Assessing performance under conditions such as temperature cycling, humidity, and mechanical vibration when applicable

End Result: Successful completion of FMVSS 108 testing confirms that your automotive lighting product meets or exceeds the regulatory requirements.

Our Testing Locations: Grand Rapids (Kentwood), MI; Cortland, NY

Master FMVSS 108 Compliance – Download the Expert Guide

FMVSS 108 establishes the essential safety standards for automotive lighting and reflective devices, ensuring compliance with U.S. regulations. To gain a strategic advantage in the market, download our complimentary white paper now to learn more.

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