I'm now using XTAR Walrus D08 for night time photography and video since I was given the opportunity to review the light a few months back.
I'm using the inbuilt Red light to spot the subject (if it's a living thing, Red or Green tend to not spook the subject too much), and use the High mode or Low mode depending on the scene. It uses 4x18650, so it lasted quite a while (a couple of hours) before needing a recharge or change of battery.
I'm still learning... I found that a camera (mounted on tripod) with large sensor and high ISO works well, and a little light does go a long way for night photography to bring out the details of the shot. I like to use very diffused light source instead of spot light coz my preference is to preserve the natural habitat of the scene as much as possible. But note that I'm no professional photo/video-grapher... 