If I were you, instead of going with red bulbs, I would go with the Moon bulb, because it looks a lot better and it doesn't emitt much light, especially put on a dimmer. You can leave it on at night, it won't stress your snake out.
BTW, that's the other thing you need, you need to purchase 2 dimmer switches, they're like $10 at lowes/home depot. You can control the light/heat with it.