It helps to try to find something with a red filter, it preserves night vision yet still allows you to see what you're doing. If you don't buy one with a filter you can usually find attachments for the more popular brands.
Like this:
Personally I use one of these:
http://www.popularmechanics.com/tech...adgets/4317410
It's got a bright white LED, Red, Green, Blue and IR capabilities and runs off AA's. So far I love it and haven't had any issues with it. I