If you want to watch them at night you can always install LED lights that you can change the color. BPs dont see the color red so if you want to observe them, you can change the color and enjoy. Here's the link to the thread: http://ball-pythons.net/forums/showthread.php?t=210139
Keeping a normal light on all day/night might stress out the animal. Also, snakes "see" green and yellow pretty well so there's a possibility that that can also see blue. However, they cannot see the color red.
Here's the light study just in case you're interested: http://ball-pythons.net/forums/showthread.php?t=208992
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