German Researchers at Geisenheim Find Significant Benefits Growing Herbs with Valoya Lights

Reading Time: 2 minutes

Valoya’s wide spectrum light and other light sources were studied at a supplementary light source trial at Geisenheim Horticultural Center, in typical central European greenhouse conditions.

Valoya’s AP673 spectrum, designed for leafy greens and herbs to maintain plants in their vegetative stage longer, resulting in high number of leaves and larger biomass. This was evident from the results at Geisenheim, where it provided the best growth for parsley and basil. The researchers analyzed the results not only by marketability of the plants, but also from a production cost point of view. The trial included also High Pressure Sodium (HPS/Son-T) lights and narrow spectrum red and blue LED lights.

The plants under Valoya lights were stronger than those under a red-blue LED light source from another manufacturer and under the HPS.

The stems of parsley were noted to be thicker and leaves curlier under Valoya AP673 light, a positive feature with parsley, than those grown under other light sources. Further, researchers evaluated the herbs to have the best overall appearance under the Valoya lights. In addition to good quality and high biomass production, the energy costs per herb pot produced, was significantly lowest with Valoya AP673 (Figure 1). Valoya saved 40-51% of energy compared to HPS, whereas the other narrow red-blue LED light source saved only 11-31% compared to HPS, with same test settings.

Geisenheim energy consumption

Figure 1 energy consumption was lowest in AP673 compared to other light sources in all three experiments (Satz 1–3). Energy consumption was calculated for parsley ‘Xenox’ and basil ‘Dolly’ as euros spent per pot (Topf). *) 22,75 pots per m2, electricity  price 0,30 €/kWh.

The full report can be found at:

The blog posts are written by Valoya’s biologists and engineers. All of the content is original and is aimed at helping growers and researchers get a better understanding of the LED grow light technology.


Recent Blog Posts

  • Valoya trial demonstrates up to 30% higher biomass with Lumi-VF spectrum.  
  • Insight into the Crop Science companies and universities in UK
  • Potential and Challenges of 3 Types of High-value Crops in Vertical Farming 
  • Fluorescent Tubes to be phased out: Crop Science to Embrace LEDs for a Bright Future 

Recent Press Releases

  • Greenlux Lighting Solutions Names Mr. Kari Kylä-Kaila as New Chief Executive Officer
  • Greenlux Lighting Solutions achieves remarkable milestones through strategic mergers and global expansion.
  • Greenlux Lighting Solutions achieves remarkable milestones through strategic mergers and global expansion
  • Valoya Oy and Greenlux Finland Oy Join Forces to Deliver More Value to Their Customers
Privacy Settings
We use cookies to enhance your experience while using our website. If you are using our Services via a browser you can restrict, block or remove cookies through your web browser settings. We also use content and scripts from third parties that may use tracking technologies. You can selectively provide your consent below to allow such third party embeds. For complete information about the cookies we use, data we collect and how we process them, please check our Privacy Policy
Consent to display content from Youtube
Consent to display content from Vimeo
Google Maps
Consent to display content from Google
Consent to display content from Spotify
Sound Cloud
Consent to display content from Sound
Cart Overview