What is the optimal wavelength of light for growing plants (cacti indoors in a northern illinois climate)?

R Coffey datepalm at ix.netcom.com
Mon Oct 13 22:47:05 EST 1997

Scott, It really does not matter if you use incandescent or
fluorescent light. What is important, however is the intensity and the
wavelength of the light. Cacti, and all green plants, are incapable of
utilizing green light. You want to supply red and violet light. These
are the wavelengths that are useable by the chlorophyll. Plant lights
are designed to supply these wavelengths.

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