There is a problem with the 'bright' mode on the Alltel. If you don't experience the problem, it might be because you have a custom rom in which the HTCCamera1.dll is updated to what we all have.
The original problem was reported by leary. You can read it starting here. In short, the bright mode worked, but flashed instead of giving a constant bright light. It was fixed by changing that setting from 750 to 100.
I'm pretty sure it's just the archaic hardware on the titan. i hardly ever have to use bright mode, but it's nice to have it work.