If you plan on keeping a lot of SPS than 400's are really the way to go. Considering the size of that 150G they would be great for it with some Spiderlight reflectors or the Diamond Lumenarc III reflectors.
6500K bulbs definately give you the most growth. The higher up the Kelvin rating you go... the more pleasing it can be to the eye. With the Iwasaki's you'll probably need VHO actinics to make the tank look nice... you probably won't need any actinic support with the 20K Radiums.
A lot of it is preference in color, but your bulb will also help determine the colors that come out in your corals.
Originally Posted by z28pwr
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