I have a headlamp that has all 3. I use the green cause the white seems to shadow and show up form further away. Seen other hunters walk in with a white light more than a half mile away. As for what deer think, whats it really matter? They see everything in the dark without us having a light to give us away. Even when I walk in pitch dark, I still have heard them scream danger. Just use mine sometimes when I'm going through wooded areas to keep from stepping on sticks. Green works great shining straight down.