– We have noticed that there is a reddish-pink light in the sky in the evening, but we have no idea what it is, says Adinah Bjåstad Crawfurd. news meets her at Klepp, how many have noticed the somewhat abnormal sky color that reveals itself in the winter darkness. The explanation for the unusual phenomenon is that Grude horticulture in Klepp på Jæren has replaced the lamps in the greenhouse with pink led lamps. – It’s about the environment and saving money. We use 40 percent less current with these lamps. In addition, we hope to increase yields by up to 20 per cent. This is what the daily manager of Grude horticulture, Leif Johan Grude, tells us. Grude horticulture in Klepp på Jæren glows pink in the evening darkness. Photo: Odd Rune Kyllingstad / news Investment of 12 million The tomato plants in the greenhouse would have taken longer to grow if it had not been for the new pink LED lights. And the fresh color is no accident. – Pink or red light gives the most light per kilowatt. It is the light that the plants are able to utilize best. It is also a bit blue and gray in the light, so that we can see in here, says Grude. Leif Johan Grude is the day-to-day manager of Grude Gartneri. Photo: Odd Rune Kyllingstad / news For the horticulture at Klepp, the lighting investment of NOK 12 million is primarily about securing the future. – This gives us faith in the future. We know that a lot of fruit and vegetables must be produced, there is an increasing need, says Leif Johan Grude. The pink LED lights will make the plants grow faster, and the nursery will save on electricity costs. Photo: Odd Rune Kyllingstad / news Can be perceived as visual noise Several research reports have already pointed out that too much artificial light at night is harmful to natural diversity, not least too many insects. According to a new study, light pollution has increased by 9.6 per cent annually in the past decades in the places that the researchers have investigated, NTB reported in January. Helga Iselin Wåseth is a research fellow at the University of Southeast Norway. She is writing a doctoral thesis on outdoor lighting, and how it affects natural diversity. – Switching to lamps with a light spectrum that is as optimized as possible for the task is positive. Both in that it is more energy efficient, but also in terms of light pollution, she writes in an e-mail to news. Effective light is positive for the gardeners, but can be noisy for humans and wildlife, according to Helga Iselin Wåseth. She is a research fellow at the University of Southeast Norway. Photo: Marit Sommervold Light pollution can disturb night’s sleep and circadian rhythm in humans, and at the same time it has an aesthetic side. – For us humans, the pink light can be perceived as more visual noise than white light, which looks more neutral. Lysa probably affects plants and wildlife around the greenhouse. Therefore, one should think about solutions that ensure that the light is not spread out from the greenhouse. Several garners will use led Michel Verheul is a researcher at the Norwegian Institute for Bioeconomy. He explains that red and blue light are best suited for photosynthesis, and thus for plant growth. The use of red and blue LED lights uses approximately 30-40 per cent less energy than the use of yellow-white street lamps that were used before, he states in an e-mail to news. – There are several gardeners who have noticed the use of colored LED lights, especially after electricity prices have increased. But such an investment is expensive. In order to have a profitable production, a gardener must be able to produce beyond a traditional growing season. Verheul encourages consumers to buy Norwegian vegetables. – The current status is that we are willing to buy Norwegian cucumbers beyond the season, but for one reason or another not tomatoes. Imported tomatoes are cheaper, but not more sustainable than Norwegian ones. Michel Verheul is a researcher at NIBIO, the Norwegian Institute for Bioeconomy. Photo: Odd Rune Kyllingstad / news
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Pink skies in Rogaland after greenhouses have changed light bulbs – news Rogaland – Local news, TV and radio
