Blue lights or full spectrum?

[Wheelman76]

Originally Posted by Aquattro

I use a 20k MH bulb, fairly blue. When I ran LED, I ran them at 100% all colors.



In the past though, reefers used anywhere from 6.5k -10k bulbs, supp'ed with actinic for color, and results were always good. I think the real issue is hwat habbyists like to look at. The corals don't care as much. To some degree, color can be affected, but again, to the hobbyist's preferences

I think corals DO care , and very much so which spectrum of light they receive. It's been proven that red LEDs can cause damage to coral tissue if they are turned up to high , as well as many people have reported stressed out corals when running the white channel on their LEDs too high.

Also growth and colour are affected by the spectrums we choose , especially with acropora.

[Aquattro]

I don't agree, mostly. LED too high IMO is too high, too quickly from lesser light. Going from 400w MH to 6 LED units at 100% caused no issues for me.

Coral color is affected, but not sure the coral cares about that, simply adjusting pigments to compensate for spectrum. We choose to go for various colors, based on our preferences.
As for growth, typically I see more growth in SPS with whiter light, but simply due to the fact that whiter is generally more PAR.