The red.
They worked pretty well the first night, but I have to qualify that with the fact that the hunt guide had been using them for a while.
All manner of creatures seemed content to ignore the light when under the feeder. Deer, rabbits, racoons, and pigs. The pigs scattered when I flashed my night blaster, but came back almost immediately when I turned it off.
I don't think the pigs care as long as you don't startle them the way a spot-light does by just suddenly coming on.
These battery powered LED lights don't throw a lot of light, but it's enough so that you can see silouettes at the feeder and out a few feet. (4) AA batteries and they burn bright for about 12-hours. That was plenty long enough for an all-nighter.
I found them to be a very effective tool.
Hmmm..., I should get paid for an endorsement like this... :?