| Yep. Troy you have to look at it on a bulb by bulb basis. An Iwasaki buld has huge ammounts of blue and violet light waves, even though it is a 65K. its intencity allows this. the 20k bulb has the big spike in blue but doesnt have alot of intencity. SO it does as Kev said. 10K ushios have a huge spike of violet so they are viable but they lack a bit in the blue department.
To be honest on the whole most bulbs in the 400 watt and in the 250 watt will wowrk just fine and grow great colorful corals. it is just going to boil down to your personal taste in the look of the tank to your individual eye.
Mike |