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US: Low daily light integrals in northern latitudes

Greenhouses located in northern latitudes typically have low ambient light conditions during the winter months. In December, the average daily light integral (DLI) outside is only between 5 and 10 mol/m2d in the 13 most northern states (Figure 1). It is less than 5 mol/m2d in western Washington. Light transmission in greenhouses is often between 40 and 65 percent, depending on glazing type and its age and shading from superstructure and equipment. Daily light integrals (DLIs) of 2 to 4 mol/m2d in the greenhouse are not uncommon on cloudy days during this period. Why are light levels so low in the northern United States and how do they compare with other parts of the country?

Click here to read the complete article at msu.edu.