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Re: [APD] HPS, Lumens, and PAR



Daniel Larsson wrote:
> The thing is  HPS:es usually have only a big ugly spike in the
> yellow-green part of the spectrum that plants reflect or have
> to use accessory pigments to use (inefficient). So lumens
> per watt is only a measure of how efficient the bulb is in
> making human visible light, and we are very sensitive
> to yellow-green, which plants reflect.

Right, but with most bulbs that's all we get. So it's better than 
guessing. It does correlate with PAR better than wattage alone does.

-- 
Jerry Baker
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