The selected double module lamp, called TUAS Linear Toplight, has been designed as a replacement for traditional 1000W High Pressure Sodium (HPS) lamps. The module offers a comparable light level of 1,846 μmol/s, while it has an improved efficacy of 3.6 μmol/J, which results in a 53% decrease in energy consumption. The luminaire has an impressive lifetime of more than 50,000 hours.
The custom spectrum toplight module contains a specific mix of wavelengths providing an optimized spectrum for many crops to grow efficiently, with special focus on tomatoes. The module, equipped with a passive cooling system to reduce maintenance costs, has similar mounting features and cabling options as HPS lamps, which simplify the switchover to a very large extent.
Thanks to its simple hanging system, the installation of the new lamps took less time than the business owners initially expected, according to Jana Knodt. The first shipment of luminaries occurred in mid-October and the last batch arrived in the first week of December. Installation takes place progressively to ensure that production on the 11 hectares involved in the project is not interrupted. The lamps are switched on for about 12 hours a day, which is increased to 19 hours a day wintertime.