even though these be DeWalt light bulb , I have successfully use they to replace Ryobi and Sears 18v light bulb that come in the handheld light you get in the rechargeable toolkit . if you drop a lamp , the bulb will tend to go -lrb- although they take a decent amount of punishment beforehand -rrb- . I highly recommend keep a few on hand . they be very bright and can fill a room with light .