Proposal to introduce requirements and test specifications for light emitting diodes (LED) substitute light sources, including to

1. introduce provisions for LED substitute light sources into Regulation No. 128;
2. introduce a new category sheet PY21W/LED based on LED technology into the Consolidated Resolution (R.E.5);
3. establish equivalence criteria as guidance for specifying sheets for LED substitute light source categories. (These guidelines are intended for publication, with the agreement of GRE, on the GRE website under “reference documents”, similar to criteria for new filament light sources for head lighting (GRE-77-04). In addition, these criteria are being prepared for insertion in publication IEC 60810.);
4. a draft proposal to IEC concerning the cap/holder system of the LED light source category PY21W/LED, for information to GRE (GRE-80-03) only, to show the interlock feature and the differences with the cap/holder system of its counterpart filament light source category PY21W.

The current text of UN R128, Annex 4, paragraph 1.2. allows only for a decrease of luminous flux from 1 minute to 30 minutes. This has proven to be unnecessarily design restrictive as the drive electronics in a stabilized light source can lead to a slight increase in the luminous flux from 1 minute to 30 minutes. Therefore, this proposal would allow a limited increase of luminous flux from 1 minute to 30 minutes within the given minimum and maximum requirements. This proposal relates to document GRE/2018/48 retaining requirements for LR4 category light sources which would otherwise have been impacted by the present proposal.

Modification of Figure 1 (Example of allowed luminous flux behaviour of an approved LED light source under UN
Regulation No.128, Annex 4, paragraph 1.2.) to add the range after one minute and 30 minutes with a positive or negative “gradient”.