Not sure if they do or not. they are SOFT WHITE, 800 lumens. 9 watt. Supposed to last 22 years. I know its not continuously on for 22 years . Based on 3 hours per day. Light appearance is 2700K which makes it a warm rather than cool.
I don;t think it matters much to chickens. Not to mine anyways. Have been keeping chickens for about 20 years, and no complaints yet.

I only keep chickens as pets so flock is small. 20 years ago there were no CFL bulbs, so I used 24 inch tube flourescent lights. Sometimes in cold weather they took a while to turn on. I always kept lights on a automatic timer for 12 hours. The CFL bulbs turn on in cold ambient with no problems. LED's likewise. Have been keeping pigeons for about 5 years. The loft is lit up by these lights. During the day the pigeons have the option of staying in the loft, or exit into the outdoor aviary. Often they just don't feel like hanging out in the outdoors If the light was bothering them, then I assume they would want to stay out much more time. At night all lights are out. I do keep a small nite lite on always in garage where loft is. My cats share garage as well.