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…it just dawned on me. Whilst I'm no electrician, plugging 12v lights into a device that requires 12v to run doesn't sound like a good idea.
maple classic™ 
@Morgan wire them in parallel, not series, and make sure power supply can supply enough current for both circuits simultaneously
@Morgan nope, should be fine because it's wired in parallel
@Morgan (easy example of this is a power strip, which always has the same voltage no matter how many things you plug into it)
@noiob Another good point! I'm too tired to think for myself today, it seems. :P
But if someone can correct me on that, then great. :P