Diffused light has great influence on the cultivation of plants. In the Grip-on-Light project, funded by 'Kas als Energiebron' (Greenhouse as Energy) and Biosolar Cells, was, by making the light more diffuse, more light allowed than normal and that gave extra growth with anthurium and bromelia. Besides with diffuse glass or diffuse screens, the sunlight can also be made more diffuse with the daylight greenhouse system. This is an energy efficient greenhouse where lenses in the roof on the south deflect direct sunlight to a focal line. With a narrow solar collector the direct light is transferred to heat and electricity and the remaining diffuse light is for plant growth. This year this greenhouse will be used for research into light and plant growth.
We try to steer to a certain light level and try to keep it stable for as long as possible by dynamic use of the solar collector. In the morning and later in the afternoon, the collector remains a bit out of focus to allow more light on the plant. Due to the lens, this light has a diffuse character. In the middle of the day, the collector will be hanged in the fire line, to reduce the surplus of direct light.
Cages with screens
We expect the plants to grow better, because they have a more stable light level. The greenhouse is divided into three parts and with "cages with screens'', three different light levels will be created, namely 4, 7 and 10 mol/m2/day. The main crop in this study will be Spathiphyllum, but we will grow a number of other crops like some orchids, bromeliads and green potted plants.