I have a small clip on with 3 green LEDs that goes on the hat bill. Not the brightest, but worked for me. Clip broke, so started to carry it in my hand. On multiple occasions I was able to walk in and see deer eyes light up, stop, pull up the binos for somewhat night vision, and see a buck standing about 20 yds away. Each time was pretty cool. I have a couple others that have white and red LEDs, and I think one has "bloodtracker" which is kind of purple.