Got Serfas 9-Led Cross Pattern couple of weeks ago & it's an excellent rack light. Easily as bright as the original Hotshot with a much wider beam so it's quite visible in the daytime. The box says it's 40 lumens & I believe it. There are two of them: one with an USB port and one without. Both run two NiMh replaceable AA batteries. Or you can use regular alkalines. I got the own with USB for $3 more & glad I did because I like the port so the batteries can be charged in the light itself. I replaced the original batteries with Eneloops which have more capacity so they'll last even longer.