If anyone is looking for a light that works great every time check out the Predator 900. I ran across this light online and picked one of these up a couple weeks ago, and holy s#@$!! I have used a lot of lights over the past 8 years of predator hunting and this is by far my favorite. I've picked up eyes at over 400 yards and it lasts for hours before losing power. Its kind of like the xlr250 kill light but a little brighter and costs less. I put a link to the website below.
http://www.predatorscopelight.com/