Here's an old picture of my 13 gallon nano. I "Photoshopped" two images together. The left side is lit by household mini-CF bulbs (the spiral type). The right side is either entirely or just partly lit by the Coralife 50/50s. (I took the picture a long time ago - I can't remember the bulb configuration. I do know that there were three bulbs, though.)
You can see quite a colour difference. The 50/50s are worth the money. I now have four of them lighting up my 13 gallon tank, and two on my 6 gallon tank (all are the 20W bulbs). I love these bulbs.
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Huge Tits live