Horizontal light distribution is more important then vertical distribution : diffuse light: deeper or broader into the greenhouse?, In Greenhouses : the international magazine for greenhouse growers, 2013-01-01, M. Arkesteijn, http://edepot.wur.nl/278816
Good horizontal distribution of diffuse light is very important, according to plant physiologist Anne Elings of Wageningen UR Greenhouse Horticulture. Diffuse light only penetrates a little deeper into the crop than direct light. Therefore the wider spread of light occurring under a diffuse glass roof would appear to be the reason for the extra percentage higher production. Actually, it’s just as “dark” at the bottom of the crop with diffuse light or direct light.
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