RE: Watts

["Ashcraft, Bob" <BAshcraft at medrad_com>]

> Date: Sun, 08 Aug 1999 13:18:23 -0700
> From: Wright Huntley <huntley1 at home_com>
> Subject: Re: Watts
> 
> > Date: Sun, 08 Aug 1999 17:33:26 +0800
> > From: Alfred Heng <alheng at pacific_net.sg>
> > Subject: Watts
> > 
> > Dear Wright
> > 
> > This was the info I was looking for as well.  If I were to use MHD
> lights,
> > how many watts will I need per gal?
> 
> About the same as fluorescents, I would guess. The Lancaster article shows
> them as slightly more efficient, but the shape factor is less efficient
> for
> rectangular tanks.
> 
> I would plan on at least 2W/G, and then put up with less than bright
> corners. IDK if others with experience with them agree or not. [I have
> none.]
> 
> Wright
> 
	It depends on the type of fixtures used.  Pendant lights, which are
suspended, usually about 12" above the water surface, need to be of a higher
intensity since a large amount of light escapes due to the open area under
the pendants.  When using pendants, generally 1-175 watt light per 2' of
tank length is recommended.

	If an enclosed fixture is used, I would say to use the same as
fluorescents.

	Bob Ashcraft
	Pittsburgh, PA

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