Frequently Asked Questions

Is DOT certification required for automotive lamps?

DOT does not certify lamps. Manufacturers ensure FMVSS compliance and maintain quality control processes.

Can I have my product tested under multiple trade names?

Yes, you must certify that each trade name represents the same tested product.

If SAE updates a specification, are older products invalid?

Products regulated by DOT remain valid under prior SAE standards. Check state regulations for local compliance.

Are there special rules for testing LED automotive lamps?

Test the device at the manufacturer-specified design voltage. Warm-up times of 10–30 minutes may apply.

How do I petition for amendments to FMVSS No. 108?

Follow 49 CFR 552.4, including petitioner details, English language requirements, and the prefix “Petition.”

Where can I find bicycle lighting requirements?

Refer to the Code of Federal Regulations (CFR), Title 16, Part 1512. You can also visit CPSC.gov for more guidance.

How do I convert luminance to illuminance?

Use standard lighting tables or formulas provided in engineering references.

What is a lumen?

A lumen measures luminous flux. For example, a 1 cd point source at the center of a 1 m radius sphere emits 1 lumen per unit area inside the sphere.

Where can I find more resources about lighting regulations?

Visit our Info Center for documents, guides, and links to government and industry sources.