I have been a big fan of these LED Moon Lights.
http://www.lightyourreptiles.com/arc...reptile-cages/
They are not expensive, are totally waterproof and compliment the LED strip lights I use from Menards.
The top photo misrepresents how much light is thrown off to an extent. I have the shutter open on the camera. But you can see in the lower pictures that the blue light isn't that bright compared to the standard LED white strip.
I usually give all the snakes 2-3 hours of moon light before blacking out for the rest of the night.
These lights are also available in red.