not sure how long you've been doing this, however over the last 30 years, I've never hunted without a headlamp
if you do, you're missing a lot of eye's,
turn your headlamp on when you get out of the truck, and don't turn it off until you get back to the truck
once you get them in your headlamp cone, turn your gunlight on and bring your gun up, once you hit them with a light, never take the light off them