<a href=showthread.php?s=&postid=15202447#post15202447 target=_blank>Originally posted</a> by gabbagabbawill
well, supposedly they can easily dim to 20% of their max output, and when dimmed become VERY efficient. So, if you don't need 400W, there is no need to run it that high... unless you wanted to.
I guess that it would be great to set up a program to simulate the actual sun, you could have it go from 20% to 100% over a two hour period and be back down to 20% in another two hours. You could have a full sunrise and sunset effect. Just guessing, but I can only imagine that corals would LOVE this.
Even if you didn't go full blast and only revved it up to 80%, you'd be saving energy on efficiency, based on the manufacturers suggestions.