Agree. My 20g has one of the older-type incandescent hoods (takes two screw-in bulbs) so I use the CFL spiral bulbs. GE make them in 6500K and 5000K, I prefer the 6500K. These come in different wattages, and because the bulbs are identical in spectrum and manufacture, here you can use wattage as an indication of intensity. Over my 20g I have two 9w CFL 6500K bulbs. They also come in 13w which would obviously be a bit brighter. For my purposes, the 9w are very adequate.
If you have or can find a fluorescent T8 fixture, a Life-Glo 6500K or Zoomed UltraSun 6500K would work.
Then there is LED which is great if you know what you are getting and it is suited to plants. Much of the LED is not, I've sent back five fixtures and given up as the good LED is very expensive. But, if you can get what works, it will be ideal.