I do a lot of spotlighting for deer here in New Zealand, there is no season on deer, they are considered pests and spotlighting (using a light to see deer at night so you can shoot them) is legal on private property. In fact it is very popular amongst the carnivores here!!
We use LEDlenser hand held torchs for this. The LEDLenser brand is very well made, excelent light output, and focusable.
My earlier question was how will your light compare with one of the LEDlenser X14. Go to website http://www.zweibrueder.com/ENG/startseite_1024.php
if you are interested.
I am keen to get an LED spotlight that will have a bit more range (Light throw) than the X14, while being light weight etc. I would run it off a motorcycle battery in a back pack. I am also keen on some good LED lights for my KTM. The curent axuliary lights I have are halogens and the draw more current than I care to think about from my bikes system.