I haven't tried one of the Ultras, but it seems like way too much light for indoors.
I want one for a carbine though. That would be good for clearing big outdoor areas. Which I occasionally do...
"If you're not shootin', you should be loadin'. If you're not loadin', you should be movin', if you're not movin', someone's gonna cut your head off and put it on a stick." -Clint Smith