FIELD: agricultural engineering. SUBSTANCE: device has a revolving shutter like screen in the form of plate elements. The screen is provided with three groups of transparent plates 4, 5 and 6. The transmission area of the first group is within 380-500 nm, that of the second one lies between 500 and 600 nm, and that of the third group amounts to 600-700 nm. Each of plates 4, 5 and 6 is connected to a common drive by rod 9. EFFECT: higher efficiency and reliability. 2 cl, 4 dwg
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