I found these rechargeable lightbulbs at Lowes a few weeks ago.You use them as a lightbulb and then if your power goes out these will kick on and last for 3.5 hours! They will flash for a few seconds before they go out all of the way so you can be prepared for the dark! I bought 2 of them. Put 1 in the living room and one in my son’s room. They are surprisingly bright, even after the power goes out. I have been using the one in the living room every night. By time I get ready for bed , It goes out on it’s own.