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Re: [APD] HPS, Lumens, and PAR

Jerry Baker wrote:
>According to these people
>HPS emits about 19% more PAR than MH.
>I believe those guys are pretty careful with their $$$ and plants ;)

Oh yes they are =), but they only calculate PAR, which PUR-efficiency
incorporates but also weights to the action spectrum.

You can get very much PAR from any bulb, if you just
put in enough electricity.

But if you want maximum growth to the least amount
of electricity HPS:es are not the better choice.

Best regards
Daniel Larsson
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Aquatic-Plants at actwin_com