Yup, another ThruNite Ti problem thread. Mine is the Ti2 in blue, the XP-G2, 3 lumen low, 81 lumen high version. The light wouldn't go into low mode after only one use. I logged on here to diagnose the problem. "Just pull the small metal tab up a little" was the common fix. So I get the head off and... there is no tab. It's already been broken off. I sent an E-mail to ThruNite's customer service, and they're out of blue Ti2s. I can wait until they come back in stock, or get another color as a replacement. I chose black (I hate gold, and their red looks like pink). No idea how long it will take to get here. No idea what problem it might have. I haven't had one of these lights before, but right now I'm a little irritated that one use (it worked just fine when trying it out) is the light's limit.