The Task Force on Substitutes/Retrofits reports progress on LED substitutes and retrofits. Actions completed include Step 1 on LED Substitutes and Step 2 on LED Replacements covering administrative and technical items. The Front Fog cluster H8, H16, HB4 was approved by WP29 in March 2026 and entered into force. Current focus is the High Beam cluster HB3, HIR2, H9 and H10, with technical discussions ongoing in GTB WGLS and H10 LEDr draft category sheet submitted. Market surveillance requires improvement across control points from manufacturer to road-side enforcement.

Category H10 sheet defines LED light source H10_LEDr dimensions, electrical and photometric characteristics, and measurement requirements. The LED light source shall not exceed the envelope indicated in Figure 2 and shall function in either voltage polarity. Essential characteristics include rated 12 volts, 21 watts, luminous flux 850 lm ± 15%, cap temperature maximum 100°C, and electrical current 1500 mA minimum at 12–14 V DC. The document specifies screen projection requirements using box systems, contrast requirements, and normalized luminous intensity distribution measurements in C-planes per CIE Publication 70-1987.

Proposal to introduce new LED light source categories L2 and L3 in R.E.5. Further details can be found in informal document GRE-94-12.