These 50w GE GU10 bulbs replaced 2 blackened grease coated cooker hood bulbs. I unscrewed the hood bulb covers counterclockwise, then the old bulbs (I had to use paper towels for the hold), cleaned the covers with dish soap, screwed in new bulbs, then the covers, checked the light, showed my lucky wife. The GE bulbs were in individual blister packs for resale and were purchased in packs of 6 from Bulbs"n"More (FBA).