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Light quantity is measured in a daily light integral (DLI)
which refers to the total amount of light a plant receives in
one day. A plant requires a minimum DLI just like it re-
quires a certain amount of rainfall. The following values
were obtained from a set of experiments performed at
Clemson University.
SPRING EXPERIMENT
The spring experiment measured plant development at 0%
shade (18 mol/day), 25% shade (12 mol/day), 50% shade
(6 mol/day), and 75% shade (3 mol/day).
Plant Commercially
Acceptable Quality
Highest Quality
Begonia 6 mol/day 12 to 18 mol/day
Pansy N/A 18 mol/day
Marigold 6 mol/day N/A
Angelonia 12 mol/day 18 mol/day
Petunia N/A N/A
Impatiens 3 mol/day 6 to 12 mol/day
Plant-Specific
Light Requirements
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