I have never used a red light in my 5 years of raising chicks and all my chicks have been fine. Occasionally I have had one peck at toes but they get over that within the hour. Red is good if you can get one that is not to hot. I could only find a 150 Watt bulb and I decided to use a regular bulb. I start with 100 watts and move down to 75 as their need for heat changes. I actually use the bluish tint Full Spectrum Bulbs. For birds that are caged it helps duplicate more closely the suns light.