If I remember correctly there are also lighting effects you can place.. does that work?
You can set the lighting effects for each room manually using the edit functions.
If the Crystals are just for decoration then they should probably light up but I don't remember any of mine doing that.
If they are ones that have a function then they probably need some control or power in the base to make them work.
I can't check as my PC is broken.
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If I remember correctly there are also lighting effects you can place.. does that work?
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There are static lights you can place, but you can't edit them for colour or intensity (AFAIK). Not sure if there are any green static lights either 
find me: @Ebon Hawk or @Jayd Dragon on Union
while building the SG base and looking through the arcane goodies available i noticed the varying sizes of Glowing Crystals. Now ive seen them in other SG bases and they put a cool green glow around, the problem being that mine dont
how do u get then to actually glow?