Yes I think it's powered by the device, too. I thought the AAA batteries on the T1 case are better than powering the light by the device but in fact I always worry if I'm draining the batteries too much. I think one battery in the device should be enough, and it's more environmentally friendly of course.
And concerning the question if the light is detachable: I don't think so. I think you put it into the cover somehow if you don't need it. If it would be detachable you'd need to care about the stylus and the light. You'd have three items then. I don't think that this would be a good idea.
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