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Blackout screens

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To promote the growth and flowering of certain plants, it is possible to manipulate day length. For example, for producing a chrysanthemum, one can use blackout screens during summer and low-intensity lighting during winter. The purpose of blackout screens is to shorten day length by blocking light from outside.

Different types

There are several types of screen fabrics used for this purpose, including banded screens, foils and woven plastics. These screens are usually white or aluminised at the top to reflect light and black at the bottom to promote blackout. Many screen suppliers recommend using a double screen for the best blackout. However, using screens to shorten the daylight period can cause problems on hot and sunny days, as the temperature inside the greenhouse rises even with fully opened vents.

Save 20 to 30% of energy annually

Blackout screens are an excellent way to save energy. They are almost light-proof and can save up to 80% of energy, depending on a number of factors. When using a movable blackout screen and good gap sealing, making the most of the "dark" hours and cyclical periods can save between 20-30% of energy annually. When using a double screen, the energy savings are even higher.

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