oh yeah I guess I should mention one more thing about those PAR meters before you go blow your money. First off they are expensive.. the cheapest one I found was over $150 US. (another reason for PAR's lack of acceptance.)
Second and more importantly, they all then to be "calbrated" for the sun. and come with a handy multiplier chart for different lights.. the problem is these multipliers are for generic lights and I dont think include evl yet.
I think the best way to figure out par for us.. is to get an acurate spectral graph and measure the area under the curve with respect to par. Figure out the ratio between red and blue and then multiply by the respective watts. Unfortunatley this makes my brain hurt and I'd rather just demand my bulb manufacturer include the PAR rating.
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