Why do plants need light?
Light is one of the main key factors that influences development and overall growth of plants. Without enough light, plants are susceptible to illness, discolouration and overall decay. Each plant needs two phases – day and night. The day phase takes place as soon as the light intensity reaches more than 400 lux. At that moment, the photosynthesis begins and the plant starts to produce its growth substance. The diversity of the light spectrum is also important because the plants use the red component of solar radiation for its growth and blue component for its flourishing.
Light coming through windows in not enough.
Glass panels absorb large amount of light and therefore only about 50% of light reaches the plant. The amount is further reduced by distance from the glass window itself. If the plant is just 2 metres away from the window, it already has 4x less light.During spring, autumn and winter the light situation becomes even more severe as the overall amount of direct sunlight is down to its minimum with short days and long nights.If we want the plants to prosper, we must ensure that they have enough of artificial light substituting the natural solar radiation.
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