Question 1

Are all LED headlight bulbs legal under ECE R37?

Accepted Answer

No. UN R37 includes LED replacement light sources only within established LEDr categories and approved types. A bulb that fits the same socket, carries a familiar model name, or has an EMC document is not automatically an ECE R37 LEDr. Check the current category status, the approval communication, the holder, and the marking on the exact product. Road use also remains subject to the approval conditions and destination-market rules.

Question 2

Does an E-mark alone prove road use?

Accepted Answer

No. An E-mark includes a country identifier linked to the approval authority, but the mark alone does not identify every fact a buyer needs. Verify the applicable regulation, approval code, category, LEDr identification, holder, and certificate. Then check whether the product is used within the approval scope and local rules. Do not treat CE, RoHS, or R10 markings as substitutes for an R37 LEDr approval.

Question 3

Which LEDr categories are currently listed?

Accepted Answer

As of mid-2026, R.E.5 Group 5 lists C5W, H8, H11, H16, and HB4 as approved LEDr categories, with H8, H16 and HB4 effective from 11 March 2026 under Amendment 12. H10, H9, HB3 and HIR2 have had their technical specifications finalized at the GRE working-group level, with formal submission to WP.29 expected in October 2026 and entry into force not expected before 2027 — none of these four is yet an approved category. H4 and H7 are not listed as UN R37 LEDr categories. Check the dated status table above before publishing or purchasing.

Question 4

What is the difference between R37 and R128?

Accepted Answer

R37 covers filament light sources and LED replacement light sources for corresponding filament categories within its scope. R128 covers LED light sources for new lamp designs within its own scope. An R128 approval does not prove that a replacement bulb is an R37 LEDr. Ask for the regulation and category shown on the approval communication for the exact product.

Question 5

Does R10 make an LED bulb road legal?

Accepted Answer

No. R10 addresses electromagnetic compatibility requirements for electrical or electronic equipment. It does not assess the full R37 LEDr requirements for category, emitting geometry, photometry, thermal behavior, marking, and type identity. R10 evidence can form part of the technical file, but a stand-alone R10 document cannot prove an R37 LEDr approval or unrestricted road use.

Question 6

Can a distributor use the manufacturer's certificate for a private label?

Accepted Answer

Not by simply changing the logo. The approval is tied to the approved type, applicant or holder, trademark arrangement, and required markings. A different-trademark arrangement for an otherwise identical product must follow the applicable approval procedure and produce supporting documentation. Any change that affects construction, optical output, electronics, rating, thermal behavior, or type identity needs an approval assessment.

Question 7

What should importers verify?

Accepted Answer

Importers should verify current category status, the complete approval communication, holder identity, approval code, product marking, packaging, applicable technical reports, R10 evidence, and the supplier's CoP plan and records. The commercial model, sample, production unit, and documents must refer to the same approved type. Importers should also record the document revision and review the destination market's conditions before making road-use claims.

Question 8

What is the next step for B2B buyers?

Accepted Answer

Send the supplier the target category, voltage version, markets, volume, and brand plan, then request the approval pack before ordering samples. Review the document identity, inspect controlled samples, resolve private label procedure, and anchor the approved type and CoP access in the purchase order. Buyers considering H11 can start with the H11 LEDr product inquiry, while keeping the order in review until the evidence chain is complete.

Author: LEDOAUTO Product Design Team

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