likely battery life will STINK.

i have a small spotlight that you can unplug from the car and use...it starts dimming immediatly...just too much juice and not a big enough battery....

heres a thought.....a miners style light...commonly used for coon hunting....spot them from the road...get out with the coon hunting light(some have spotlights, mine doesnt and i dont need one, my head is BRIGHT) get out and "stalk" into range...probably wont be real hard to get within 100-200yds using terrain, wind and the cover of darkness...then you can setup a tripod and run the light easily...probably wont do anymore harm than actual spotting from a vehicle does....ive seen mannnnny deer absolutely bolt when a light hits them or a vehicle slows...just a thought...i might do some of that here soon(minus the video taping) just to sneak into areas vehicles cant reach(cornfields next to roads, treelines against the road hiding the fields etc...)

you wouldnt believe how close you can get to a deer in the dark....my shorts are still dirty from an encounter....last year? or 2 years ago...me and my buddy cut the dog loose and drove to a coldisack in a housing plan thats being built we have permission to turn loose in...got out...shut the doors and hit the fields just to see what was out there(always deer) when the biggest buck ive ever seen lifted his head like 50yds away...if i was in elk country, i would called it an elk....all you could see was BONE over 200yds away when he finally ran away you could still clearly see the bone in the spotlight!