I have been predator hunting for the past 6 years and I have been using the Night Eyes F6 Scan and Kill Light Combo. I am very satisfied with the performance of it. I can usually see eyes on a clear night out to 400-500 yards with the scan light, and the kill light is good out to 200 yards or more.
You can run the scan light at different settings, (Option 1 Full On, Option 2 Whatever Power you want - 50%, 40% ..etc), it can be changed to whatever your preference. The battery life is also decent with it but it can't hurt to have an extra 1 or 2 for those cold nights.