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Re: [APD] relative plant growing efficiency

Liz Wilhite wrote:
> Any takers?  Any guessers?

You're looking for PAR (Photosynthetically Active Radiation) or PPFD 
(photosynthetic photon flux density) ratings. Each bulb/ballast 
combination is different, and the numbers are extremely difficult to 
come by for most bulbs. Sanjay Joshi tests a lot of MH bulbs for 

Jerry Baker
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Aquatic-Plants at actwin_com