I have been trying to find the ceramic heat bulbs that don't give off light, just heat. I haven't had any luck so far getting one locally. The fella at the reptile/bird shop told me to get the black light used for reptiles at night. He said it gives off the same heat as a regular bulb, but the animals don't see the light well, only very dimly. The reason I'm looking for the heat bulbs is so my chicks have the natural day-to-night progression, while still being warm. (light during the day, dark at night) Can I use the black light bulb for them? I have ordered the heat bulb online, but wonder if I can use the black until it arrives. thanks, again...