I have be look for relatively affordable replacement bulb for a Ryobi 18V rechargeable flashlight . it be literally impossible to find a real Ryobi product , but I read , in another review , that these work in the Ryobi . they do , indeed . I have not use any of these for any time at all , but i do verify that they work in the Ryobi , and I be thrill to have some replacement now . the original bulb burn out almost immediately , and they replace it ` under warranty ' , but I be concern about he fragility of the OEM bulb . glad to have find a replacement such that the flashlight will have a use if another bulb fail .