Hello BackYard Chickens Community, I've been having an issue lately with my Georgia Bobwhite chicks. I'm from California and here the temperature is starting to plunge in the 50s at night. I've been losing some chicks from day to day. I think it is the cold that is killing my chicks. Right now I am using a 73 watt light bulb. What light bulb wattage should I use? Much thanks to you guys.