Zoo-Med Reptisun/Naturesun 2.0 bulbs. They are full spectrum bulbs that make a display cage look great.
Comparison between a normal T8 Fluorescent tube and a Zoo-Med Naturesun 2.0 bulb:
(Zoo-Med bulb on the right)
The best part is that they aren't that expensive. An 18" T8 tube runs around $20
*Note that reptisun 2.0 bulbs and Naturesun 2.0 bulbs are the same thing. Zoo-Med decided to rename their 2.0 bulbs. reptisun 2.0 is the old name, and naturesun 2.0 is the new name.