My DH and I are getting our 2 girls ready for winter...they are in a part of the barn that is the size of a single car garage. There's pine chips on the dirt ground, hay and straw bales around the edges to keep the drafts out, and bales up to their roost. Being such a large building for just 2 sweet little girls I wanted a heat light for them above their roost. I just tried it out tonight for the first time and at dusk when I went down the light was on and they seemed unsettled by it. The fixture has been hanging there for a week, today was the first time it was turned on. It's a red heat bulb that we had in our bathroom. I was wondering if that would be a different type of bulb than what I should use for the girls in the barn? I thought they acted too alert, though they were on their roost, but they were being active and chatting. When I turned it off they went right into their sleepy cooing. Is there a different type of bulb that I should use, or will they get used to this one?