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Jason McKenzie · 05-10-2005, 08:27 AM

I believe it is a matter of light intensity hitting then not colour temp. Many people feel colour temperature will effect the tissue colour of the coral. This is why the sudden influx of "blue" or hight K rated bulbs, like 20K and Radium. Florescent bulbs have a distinct draw back to MH bulbs because they produce a very narrow band of light. For example if you were to buy a 10K PC bulb it would only produce light from say 8500K to 11000K were as a MH bulb would produce the full spectrum with emphasis on 10K. So there is lees of a need to think about coral placement under MH bulbs.
Also MH bulb colour temp dies off from the minute its powered up were as PC bulbs may loose intensity but do not change colour temp.
Finally blue light has the greatest ability to penetrate water. While the yellow/red light is absorbed relatively fast. So you could see better growth and colour with your SPS under your Atinics but is may only be because they are getting more light.

Sorry to ramble one.

Jason