I have used a similiar method, street glow's neo-blue neon lights that were designed for cars as cathodes are also used in cars but mainly for computers.
Not hard at all, takes me like 15mins to turn one into aquarium ready moonlighting.
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I am planning to add the "moonlight" to my tank also. Let me do a bit more homework and I'll get back to you in a bout 2-4 days. It should be pretty simple
u can use any power cord as long as it brings the volts down to 12 volts or less.
the lower the voltage. the less bright or the less power ur lights are getting.