Green seems to be very popular these days, but it seems to spook game worse than red. Green is easier to see and does the best job of illuminating your target and giving a good sight picture, but red is less visible to game and has less chance of spooking. Green was ok for raccoon, but seemed to really spook coyotes. I much prefer the benefits of green lights, but game seems to prefer red, so thats what I use. Whether it was a scope mounted light or handheld, I used to make the mistake of putting the beam directly on the animal. Took me awhile to figure out why I was spooking off so many critters. Learning to use the lower portion of the light beam and not the whole beam fixed my problem.
I use a light similar to the Primos Nightblaster Max 350. My light is old and don't even remember what brand it is, but its very similar. The light itself is lightweight, but the 6volt battery you have to carry isn't. Though carrying around a battery can suck, the amount of light it puts out is worth it. For coyote hunting, it works for both scanning and as a kill light. Even though I really like the XLR250, it requires me to carry a handheld spotlight for scanning fields and such. It just doesn't put out enough light for such a task. But, for around the house you can't beat how compact the XLR or a similar setup is compared to something like a Nightblaster.