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[APD] PAR sucks because plants are green

>According to these people
>HPS emits about 19% more PAR than MH.

The thing is: Any photon that is between 400 and 700 nm
will be included in the PAR-measure, including green.

An all green bulb (or yellow like HPS:es) can have good PAR.

That's where it hurts. The electricity bill that is =)

Best regards
Daniel Larsson

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