The meeting reviewed proposals for LED retrofit (LEDr) categories including H10 front fog lights and H9 high beam types for Regulation 37/RE.5. Key discussions addressed H10 failure requirements, H9 dual-voltage flux levels, and homogeneity requirements for B-type boxes. The task force also focused on market surveillance and enforcement mechanisms to ensure only approved LEDr products are used on public roads. The next meeting is scheduled for 20 April 2026.

The Task Force on LED Substitutes/Retrofits reports on progress toward GRE-94. Completed actions include LED Substitutes (Step 1) and LED Replacements/Retrofits (Step 2) with administrative and technical items. Front Fog cluster H8, H16, HB4 was approved by WP29 in March 2026 and entered into force. High Beam cluster HB3, HIR2, H9 and H10 discussions began in WGLS in November 2025, with presentations to TF S/R in March 2026. H10 LEDr draft category sheet is submitted as informal document. Market Surveillance identified as necessary support activity, addressing control points from manufacturer to road including approval, import, point of sales, PTI, and enforcement.

The Task Force on Substitutes/Retrofits held its 27th meeting on 20 April 2026. The agenda TFSR-27-01 was adopted with focus on agenda item 10. The report of the 26th meeting TFSR-26-05 was confirmed. GTB WGLS will continue work on category sheet proposals for high beam cluster, anticipated for submission by end of May. H11 LEDr entered into force in November 2024; H8 LEDr, H16 LEDr, HB4 LEDr entered into force March 2026. Document TFSR-27-02 was reviewed page-by-page and agreed changes implemented; the secretary was asked to submit this document and the draft H10 LEDr proposal to GRE94 as informal documents. The next meeting is planned for 15 June 2026.

Revision of TFSR-26-03 addresses H9 LEDr flux considerations and dual-voltage specification. The document proposes applying a single specification for H9 LEDr: 1875 lm ±10% @13.2V, representing a compromise between high-beam and low-beam applications. This luminous flux level is not critical, as high-beam measurements with H9 filament bulbs exceed legal minimums by more than 10%, and low-beam safety margins remain acceptable with limited flux increases. Additionally, a black-top limit of 50 cd/klm at control point zero is proposed for bulbs without black-top specification, and LEA sub-zone specifications (B1, B2, B3) for high-beam categories should be optimized to support beam performance.

This document defines essential dimensions, electrical characteristics, and photometrical requirements for LED light source category H9. The LED light source shall not exceed the specified envelope and shall function in either voltage polarity. Rated values include 26 watts at 12 volts and 26 watts minimum at 13.2 volts, with minimum luminous flux of 2000 lm and cap temperature not exceeding 100°C. The luminous flux measured at elevated ambient air temperature shall be at least 75% of objective luminous flux. The document specifies screen projection requirements, contrast requirements, and normalized luminous intensity distribution requirements across defined C-planes and test points.

This document specifies requirements for category H₁₀ LED light sources with PY20d caps. The light source shall not exceed the outlined envelope and shall function in either voltage polarity. Essential characteristics include rated values of 12 volts and 21 watts, with luminous flux of 1500 lm minimum at test voltage. The luminous flux measured at elevated ambient air temperature shall be at least 75% of objective luminous flux. Screen projection requirements define light-emitting area positioning using box systems. Normalized luminous intensity distribution requirements are specified in C-planes with defined test points and minimum/maximum intensity values in cd/klm.

This document defines category HIR2 LED light source specifications. The LED light source shall not exceed the envelope indicated in Figure 2, be concentric to the reference axis, and function in either voltage polarity. Essential characteristics include rated values at 12 volts DC of 26 watts power and 2000 lm minimum luminous flux. Cap temperature shall not exceed 63°C at test voltage or 100°C at elevated ambient air temperature. Luminous flux measured at elevated ambient air temperature shall be at least 75% of objective luminous flux. Light emitted shall be white. The contrast proportion of luminous flux shall be 100 minimum. Normalized luminous intensity distribution shall comply with specified limits in C-planes.

Based on LS-1691, this document defines specifications for HB3 LED light sources. LED light sources shall not exceed the specified envelope, function in either voltage polarity, and be rotated in the measuring holder until the reference lug contacts the holder plane. Essential electrical and photometric characteristics include rated values at 12V and 13.2V, with minimum luminous flux of 2000 lm and cap temperature limits. Luminous flux measured at elevated ambient air temperature shall be at least 75% of objective luminous flux. Screen projection requirements specify box system proportions for light emitting areas and contrast limits. Normalized luminous intensity distribution shall comply with specified limits in defined C-planes when measured at test voltage.

The agenda includes welcome and opening remarks, introduction of participants, adoption of the agenda, report of the 27th meeting (TFSR-27-03), way forward (GRE-91-14), review of GRE-94 report (GRE-94-18), proposals for R.E.5 including H11 LEDr (entered-into-force November 2024 GRE-90-02), H8 LEDr, H16 LEDr, HB4 LEDr (entered-into-force March 2026), front fog types, high beam types, low beam types, clarification of UN R37 requirements for LEDr, enforcement and market surveillance issues (TFSR-26-04,) preparation of GRE-95 status report, any other business, and next meetings.