Anne, my chicks began getting loud at night even with a red bulb. I forget if you said how old they are, but I began turning off the heat lamp at night (yes, it was nerve wracking) and they slept through the night again. There were 6 in the brooder, and I think they were 3 -weeks- old. I did get a black light bulb. I couldn't stand not giving them heat at night. Oh! And they were on the (enclosed) back porch in April. So not in a warm(ish) house. The Leghorns were noisy from day one. If I ever do them again, it will be with a broody in the coop. Let her deal with them!
Chippy, I am so happy for you!