My New Nano Tank Journal - 20 Gallons Long Tank

[BlueAbyss]

14K bulbs are more blue than 10K bulbs, as the numbers get higher it gets more blue. A 6.5K bulb would look significantly less blue (or more yellow depending on how you look at it) than a 10k but will likely still look quite white, though they are rarely used in reef aquaria (more common on freshwater planted tanks).

On a side note, I myself would go with a 30" hood for good even light coverage unless you were planning on having a lower light region in the tank for organisms that would not do well in an intensely lit position. I have looked into this rather extensively and it seems that if you are planning on having a large variety of different organisms, ie: not dominated by SPS, having a lower light area is a good idea, to approximate the different zones of a reef better.