Free Daily Light Integral (DLI) Map Poster
Daily Light Integral (DLI) maps display the ambient light delivered daily during each month across the entire U.S. These maps were researched and developed by James Faust of Clemson University and Joanne Logan of The University of Tennessee. They are unique because DLI is a measurement of light that is particularly valuable for estimating plant growth. Other solar radiation maps created for photovoltaic purposes, i.e., installing solar panels, are not directly applicable to horticultural applications.

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