Contrary to most people’s belief, green house lighting is a major energy consumer in Europe. The current electricity consumption is estimated to be around 150 TWh per year, which is about the same as the total electricity production (and consumption) in Sweden. Today, almost all full scale green houses use High Pressure Sodium (HPS) On-Off Lamps for their lighting. They are highly efficient in the sense that they give a lot of light for a given power. However, the spectrum they produce does not fit well to the absorption spectrum of the photosynthesis and consequently a lot of artificial light is wasted.
In this research we aim at using the controllability of LEDs to adjust the light optimally to the needs of the grower and the needs of the plants. New greenhouse remote sensing techniques, based on analysis of the light from the plants, are therefore being developed for the determination of suitable continuous online feedback signals to the lamp controller.
Above: PhD student Anna-Maria Carstensen and Associate Prof. Torsten Wik in the laboratory where they are investigating how plants react to different types of lighting.
Photo: Oscar Mattsson
Press release: Plants communicate what type of light they want (Chalmerser.se 2013-04-08)
Pressmeddelande: Växterna berättar vilket ljus de vill ha (Chalmers.se 2013-04-03)
The project in media:
Rätt ljus sparar energi (SVT Rapport 2013-03-30)
Rätt ljus sparar energi (SVT Västnytt 2013-03-30)
Fel ljus i växthus slösar energi (DN 2013-03-31)
Fel ljus i växthus slösar energi (Svenska Dagbladet 2013-03-31)
Fel ljus i växthus slösar energi (Norrbottenskuriren 2013-03-31)
Fel ljus i växthus slösar energi (Skånskan 2013-03-31)