| This was from another website but I think it applies:
"As anyone who has dived at sunrise on an equatorial reef will tell you, light reaches high intensity after sunrise incredibly quickly - within minutes - so reef fish and corals are well used to the "lights on" and "lights off" syndrome: it happens in their natural habitat!
Lastly, actinic lights have much lower lumens per watt than, say, 10,000K lights. Put simply, watt for watt they are DIMMER, not brighter. The shorter the wavelength (the higher the K number), the lower the lumens per watt. A 20,000K 250W halide delivers significantly less lumens than a 5,600K 250W halide. And only deep ocean corals will grow in pure actinic light."
__________________ Robert
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“A spirit is manifest in the laws of the Universe—a spirit vastly superior to that of man, and one in the face of which we with our modest powers must feel humble.” Albert Einstein |