I'm looking for a 2-C mag body with either a 1W or 3W LED. It needs to use C cells and not 123's because of cost factors and limited run time. I don't need redicously bright, but I need extended run time. I nice white bin is a given (no yellow or green or blue tint). As far as optics, not sure if one is needed, I need a light that will give off a very broad and even flood type of light for close up work. What kind of run time could I expect from 2 C cells, or 2 D cells?