24. The expert from France noted the lack of international harmonization of work lamps and proposed draft amendments to UN Regulation No. 48 to correct that (GRE-89-21). He clarified that his proposal only intended to regulate type approval of the installation of work lamps on vehicles and not approve the lamps themselves. In the course of a brainstorming discussion, various experts touched upon such issues as mutual recognition of type approvals, the maximum speed for automatic switching off work lamps, the applicable vehicle categories and costs/benefits for the industry. Finally, GRE agreed to retain this issue on the agenda of the next session.

25. The expert from France pointed out that in some situations, the white light of type-approved front lighting units might be seen as blue, due to human eye perception (GRE-89-24). He sought the advice of GRE on what should be done in such cases. Several experts confirmed the existence of such a phenomenon, but believed that it neither undermined road safety nor justified substantial changes in the legal requirements. GRE invited all experts to find a simple solution to the problem and agreed to revert to it at the next session.

16. GRE recalled its earlier discussion on the perceived blueish colour of the white light emitted by front lighting units (GRE-89-24) and noted that the expert from France would submit a proposal for consideration at the next session.

18. GRE noted no new developments on the issue of the perceived blueish colour of the white light emitted by front lighting units, as reported by the expert from France (GRE-89-24).

20. GRE recalled the perceived blueish colour of the white light emitted by the front lighting units, as reported by the expert from France (GRE-89-24), and decided to revert to this topic at the next session, based on the considerations of the GTB Working Group Photometry.

16. GRE recalled the perceived blueish colour of the white light emitted by front lighting units, as previously reported by the expert from France (GRE-89-24). GRE noted that this issue was being followed up by the GTB Group Photometry and decided to keep it on the agenda of the next session.