Nah, they work a treat.
You can point them at bubble curtains which looks incredible, or areas of interest in the tank. Personally I reckon the shards of light look much better than a general glow anyway. Plus the power consumption is so low you can disregard it. Did you look at Sarahbravo's tank in the thread in my initial post?
I've tried to take a photo of my tank before, but my camera is useless and won't expose for long enough.
I would urge you to buy these, but it's down to your preference really.