I used a red heat lamp and it provided the perfect heat. I never had any problems with pecking either. And the chicks slept fine. I know this because I was camped out with a sleeping bag right next to them.
I think you need to be careful about spray painting..... If the light is hot, you don't want the spray paint getting hot!
Also the red light is a little more money, but IMO as well, worth the money!
The red light I think it hotter. We have both and used red when they birds were little and currently if it gets too chilly (a couple nights have been) we turn it on (also to allow them to see to go in the coop at dusk) and I believe the red light is hotter than the white. We will switch back to red I think it it gets as cold this winter as they're predicting.......