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Re: Scotts: Aquatic Plants Digest V4 #1265

Metal halides are only slightly more efficient than some flourescents. 
I believe your basic metal halide is slightly more efficient than a VHO
but perhaps slightly less than a PC.  But the difference is not great
for most practical purposes.  (The really efficient HIDs are the high
pressure sodium lamps with any extremely narrow spectrum -- everything
looks yellow under some street lamps.)

My point is just that X number of watts from any light source, after
multiplying by the efficiency (y%), is an equivalent amount of heat (X
times y%.

Whether x times y% raises a given tank's temp depends, not on the type
of light, but how it is installed, ambient temp, other heats sources,
such and pumps, etc.

Scott H.

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