If you're using it for lamping rabbits, then the brightist isn't always the best. Also, if you're lamping in an area that has seen a fair bit of lamping, then it would be well worth investing in one with a coloured lens filter. I use a red one, and the rabbits hardly move. I think I read somewhere that rabbits have a problem seeing red light.
Another thing to consider, is the weight of it. Years ago, my old man had a huge bulky thing that was very awkward to heave about for hours. I use a deben tracer, one of the small ones, and I have more luck with it than my mate who has got a much bigger