Hey,
I don't know if you've tried this or not yet, but in all my enclosures that need to maintain a specific temperature, I use flourescent bulbs attached in one of those "desk mounters". It's hard to describe, but you mount above a desk that you want lit up. The things that I realized would benefit you are the fact that flourescent lights give off an almost negligible amount of heat, as well as they are bright enough to see throughout the enclosure, but for phantasticus you only want to have as little light as necessary, as they can be easily stressed out by overly bright lights.
If you want more info I can probably dig up the box that the lights came in to give you a better idea of what I'm talking about.
Good Luck
Ian