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[APD] Re: WPG Rule

Scott H said, in part, 
   " . . . Yes. You've gotten to the issue, imo
       The issue isn't whether there are more accurate measures of
       light output -- even better, take PAR into account.
        But how many folks have ready means to measure lux at the
        bottom of the tank full of water?"

Sure, but most people can't measure color temperature or CRI, or compute CO2 
based on KH and pH.  That has already been done and is readily available on 
the web.

I am suggesting that the same thing could be done for Lux, or Par, maybe 

Better measurements of the effect of various bulb/reflector/whatever will 
become available.  It is question of when.  Maybe someone on this list can
start that.

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