Sigg first installed a double row of LED interlighting in one climate zone (approximately 1,500 m2) in the greenhouse. After a very successful year, Sigg installed 2 lines of LED interlighting in his second and third greenhouse. In 2016, he replaced his HPS lighting with LED toplighting in the third greenhouse, producing a total light level of 320 μmol/m2/s.
Since the LED interlighting is mounted between the crop rows, the light can reach the plant and keep the leaves more photosynthetically active, while less light is lost to the ground or reflected upwards. LED-based lighting emits very little radiant heat, giving growers another way to control the climate to support the vegetative or generative crop phases. LED interlighting is an extremely energy-efficient technology, producing higher yields of tomatoes using the lowest amount of energy/kg.
Sigg has seen a significant increase in the yield from his 1,500 m² greenhouse over the past year, and this convinced him to equip his entire business with 100% LED lighting.