MJBizMagazine September 2021 Lighting Buyers Guide - 15

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3. There is a difference between lighting needs for
indica and sativa strains of cannabis.
There is no difference between the strains. They both like
high light.
-Bruce Bugbee, Utah State University.
4. Plants don't need green light.
Despite many theories-such as that plants reflect green
light or green light is poorly absorbed by chlorophyll-plants
use green light. It is particularly good at helping photons be
absorbed deeper into the plant and is useful in high-light
conditions
-Erik Runkle, professor of horticulture, Michigan State
University.
5. A 100-watt LED produces the same heat as a
100-watt HPS or metal halide light.
High-intensity discharge (HID) lights generate heat because
the light is created by the ignition of gas within the lamp.
LED fixtures use thin layers of semiconductor material and the
movement of electrons between layers to generate light.
HID lights are much hotter than LEDs. Wattage doesn't
make a difference.
Hemp plants under LED lights as part of
a study looking at the effects of LEDs on
cannabis pests. Photo courtesy of Eze
Pojmann-Ezeonyilo.
-Andrew Wilmerding, representing Gavita Horticultural Lighting Systems,
a division of Hawthorne Gardening Supply.
6. Cannabis responds only to the red and blue spectrum.
While cannabis does respond to the red and blue spectrum, full-spectrum light (from natural sunlight or
full-spectrum LEDs) is the most effective for growing cannabis. Full-spectrum LEDs are similar to natural
sunlight, providing the full range of light within PAR (photosynthetically active radiation), increasing yield
and harvest quality.
-Alex Gerard, chief technical officer, Foshe.
7. Cannabis needs to be grown under metal halides for vegetative growth and HPS for
flowering.
Some growers believe the more reddish light emitted by high-pressure sodium (HPS) lights supports
flowering. However, flowering in short-day plants (like cannabis) isn't induced by different light spectrums.
It is induced by reducing the photoperiod. Switching between metal halides and HPS is labor-intensive and
unneeded.
-Marc van Iersel, professor of horticulture, University of Georgia.
8. Cannabis grown under LEDs needs more CO2
The only factor that influences the need for CO2
.
is the amount of daily light integral (DLI) the crop receives,
whether that's from natural sunlight or electrical lighting. It isn't the fixture that makes the difference, it's the
total amount of light the plant receives, regardless of what fixture is used.
-Travis Higginbotham, vice president of production, Harborside Inc.
15
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MJBizMagazine September 2021 Lighting Buyers Guide

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