Hey there! My chickens have been outside for the past two or three weeks... Two of them are around 6-7 weeks, the other two 9-10 weeks of age (white leghorn and red sex links). They are fully feathered, but at night I would put on the heat lamp in the coop where they sleep at night. Should I be OK to no longer give them this heat source? Lows for the next week never really go below 50 at all. Also, should I replace the 250W bulb with some low wattage red bulb (like a CFL, 13W bulb) or let them manage in the darkness? First time with chickens, so just want to make sure they will be ok! Thank you so much!