Q:Are the bulbs mercury free? A:Yes. All LED bulbs are mercury free. Q:How long does the bulb last? A:Life hours is 15000 hours.We have had ours for almost two years now and still good. Q:Will this work in garage during winter months? A:Yes, LED likes cold. Extreme heats they don’t like because they are electronic. Q:Is there a buzz or any other sound with these? A:Nope no buzz/sound when bulb is on. Bulb has no wait time to warm up either. Q:Are these bulbs hot to the touch when turned on? A:Not at all – no comparison to an incandescent bulb. Q:Can these fit in Household Lamps Right? A:Yes.They are standard shaped bulbs, (A21), with a medium, E26 base, (screw diameter and threads). They are made to fit just like a standard incandescent bulb. Q:Are these bulbs instant on, or do they have a lag from the time you flip the switch? A:Yes.They are instant on and are not affected by cold.Q:Are these led bulbs dimmable? A:Yes,they are dimmable bulbs. Q:Are these A21 led bulbs UL certified? A:Yes,they are UL certified.