Proposal to amend the test procedure for reversing lamps and maneuvering lamps equipped with light sources other than filament lamps. Currently, the lamps are required to meet photometric parameters after one minute and 30 minutes of operation. Under normal use, these lamps are operated for no more than six minutes at a time. This proposal would set the second measurement point at 10 minutes rather than 30 minutes. This change would also align the procedure with SAE standard J1889.1.