Q: Will this ring fit a GE 4001R sealed light? Thanks.
A: No. This ring is for PAR 36 lamps. GE 4001R is a PAR 46 Lamp. Depending on the type of housing the light is going into you would need either a U-6565-U to fit on a spotlight or decklight. Or you would need a U-8965 for a Model F1 housing.