15. The expert of the Task Force on Substitutes and Retrofits (TF SR) informed GRE about their activities (GRE-88-13) and announced the next meeting of TF SR on 14 June 2023. He reported that TF SR was considering two approaches for including high power light-emitting diode replacement (LEDr) light sources in UN Regulation No. 37 and in the Consolidated Resolution on the Common Specification of Light Source Categories (R.E.5), namely “intelligent equivalence” on the light source level and “application-level equivalence”. The experts from the Netherlands and the United Kingdom supported the first approach.