I always thought that a bright light would be the best. I have the high power cree bulb lights. I do not know that they are any better at blood trailing than a bright old fashioned bulb light. I struggle at night when there isn't much of a blood trail. I thought it was just my old eyes. Then someone mentioned that the human eye can pick up color much better when you use the old fashion bulb. Thought someone might expand on the science or experience side of this.