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Because PPFD is just calculated from a known spectrum but not related to plant light response. To check how efficient the light for plants, have to weight the value by required PAR action spectrum to get Yield Photon Flux Density(YPFD). The Value will change when the reference PAR action Spectrum changes.

In SGAL, you not only can check the total visible YPFD value but also check the value in different for light adjustment.

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【Lighting Knowledge】YPFD (Yield Photon Flux Density)
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