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Re Light Meters

<< Finally, we are more concerned with PAR and I've yet to see a photographic
 light meter that is capable of measuring that. >>

OK. I give up. <g> What in the WORLD is a difference in lighting less than 
1/4 an f-stop mean in relation to aquarium lighting please ... in practical 
terms that is as it would affect plant growth in an otherwise *well light* 

I guess It might also be useful to define some terms here, that non aquaria 
sophisticates such as myself are bound to be unfamiliar.  On the other hand I 
don't mind getting egg on my face -- well not too much anyway.

And yes James I DID misunderstand Ivo's response ... awaiting *err* 
illumination. <g>