MJBiz Buyers Guide: Lighting 23 - 14
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or intensifying light levels indoors to mimic sunrise or sunset could result in fewer hours of light and,
potentially, a decreased harvest. "
Douglas instead encourages growers to focus their efforts on ensuring the crops are exposed to bright, fullspectrum
light for at least 12 hours per 24-hour period during the flowering cycle.
" By leaning into the 12-hour photoperiod and following (certain) lighting intensities, natural sun levels
can be mimicked throughout a growing season, " notes Mark Reich, a system integration engineer at grow
equipment provider Prospiant.
Reich recommends cultivators expose their plants to 18 hours of continuous light and six hours of darkness
during the vegetative stage to promote continued growth. Then, for the flowering stage, growers should
adjust their lighting schedule to an even 12 hours of continuous light and 12 hours of darkness, he says.
THE DEBATE AROUND ULTRAVIOLET LEVELS
Some experts believe the strength of light and output of certain ultraviolet (UV) levels have the potential to
impact plant growth and quality.
" Growers can source fixtures with the functionality to increase light intensities with options to add UV into
the spectrum, " says Mike Howard, chief horticulture officer at Fohse. " This allows growers to mimic the
seasonal UV levels seen outdoors. "
Since several variables differentiate one cultivation facility from another, growers should remember that
cannabis varieties react differently to UV levels in different settings.
Growers can incorporate fixtures that add UV levels, mimicing the outdoors. Photo courtesy of Urbam-Gro
14
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MJBiz Buyers Guide: Lighting 23
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