What does 'L90' or 'L70' rating on an LED grow light indicate?
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A
The light can be dimmed to 90% or 70% of maximum output
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B
The fixture will retain 90% or 70% of initial light output after a specified number of operating hours
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C
The light delivers 90% or 70% of rated PPFD at canopy level
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D
90% or 70% of the LED chips are in the PAR-optimized wavelength range