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[APD] Re:myths/light

> Date: Sun, 5 Sep 2004 11:16:38 -0700 (GMT-07:00)
> From: Thomas  Barr <tcbiii at earthlink_net>

> And yet they are also not subjected to as much __light intensity_ either,
> remember how light drops off by the square of the distance from the light
> source.

Please remember, the Square Law only applies to a point source, such as a
single metal halide bulb.  Linear sources such as flourescent bulbs
produce illumination that drops of inversely to distance (twice as far
away, half as bright).  Also remember that this is in "free space" without
reflectors.  Light with reflectors over a tank of water is a whole
different animal.

George Booth in Ft. Collins, CO (gbooth at frii dot com)
 The website for Aquatic Gardeners by Aquatic Gardeners
   http://aquaticconcepts.thekrib.com/  (mirror)

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