I've got some. They have one 5w and one 10w bulb. They work ok (not Lumis obviously). But attaching the battery is a game. I reckon the best way is to cut the straps off, bung it in a bottle cage and tie it in with a toe strap, but I haven't tried this yet as I've been using a different light recently (Specialized Proview solo with five 7000 maH NimH D cells - about a fiver each online).