PAR, MH and LED spectra compared.
Light Spectrum and Absorption
200-280nm UVC ultraviolet range, which is highly toxic and extremely harmful to plants.
280-315nm Includes harmful UVB ultraviolet light, which causes plant colors to fade.
315-380nm Range of UVA ultraviolet light that is neither harmful nor beneficial to plant growth.
380-400nm Start of visible light spectrum. Process of chlorophyll absorption begins. UV protected plastics ideally block out any light below this range.
400-520nm This range includes violet, blue, and green bands. Peak absorption by chlorophyll occurs, and a strong influence on photosynthesis (promotes vegetative growth.)
520-610nm This range includes the green, yellow, and orange bands and has less absorption by pigments.
610-720nm This is the red band. Large amounts of absorption by chlorophyll occur, and most significant influence on photosynthesis (promotes budding and flowering.)
720-1000nm There is little absorption by chlorophyll here. Flowering and germination is influenced. At the high end of the band is infrared, which is heat.
1000+ Totally infrared range. All energy absorbed at this point is converted to heat.
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|current||10:06, 26 December 2013||634 × 495 (56 KB)||Misho||PAR, MH and LED spectra compared. Source: http://www.stealthgrow.com/facts.htm Light Spectrum and Absorption 200-280nm UVC ultraviolet range, which is highly toxic and extremely harmful to plants. 280-315nm Includes harmful UVB ultraviolet light, wh...|
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