Hi,
<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr> It is a heat sink. But removing that heat from it isn't nearly as efficient as putting a fan that is hitting the waters surface. I have tried. And had planned on doing this on my next tank until I found the best way to remove heat was not to hit the reflector with a fan but blow air across the water.
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Well...couldn't you put it on both ? Both water and reflector ? [img]images/smiles/icon_smile.gif[/img] I don't have HIDs, but I have heard that blow air at both water and lamps helps reduce the water from heating up too much. Just a suggueston...
As for the diffuse vs specular, I guess we'll need your light meter to settle this. You measure 20,000 lux....how far away from the lights was this ?
- Victor.