I use these submersible aquarium lights- Hagen Marina Micro L.E.D. lights.
They come in blue (simulates moonlight) white, green and red (nocturnal viewing). The have suction cups so you can stick them anywhere inside the viv. and they are adjustable (up and down) so you can direct the light where you want it. You can buy the "hub" which lets you connect up to 3 of the micro lights to one power switch.
I have 2 micro lights in my viv now (blue and green) and have them on opposite corners, it looks cool and Annie my anery (sp?) absolutely loves the lights. I will turn off all the lights in the room and turn on the micro lights and Annie will come out to investigate usually within 5 min. of turning the micro lights on!
I will try to get a pic of the viv lit up, I tried when I first got the lights, but my cheapo camera could not take a decent pic without a flash.