Dutch grower uses supplemental LED lighting

　　Plessey has announced the results of a horticultural LED lighting trial at Alstroemeria grower Together2Grow located in Poeldijk, South Holland, the Netherlands. The grower worked with Plessey to test LED lighting as a supplement to high-pressure sodium (HPS) lighting in a portion of its greenhouse dedicated to the Virginia variety of Alstroemeria. After seven weeks of supplemental solid-state lighting (SSL) usage, the grower noted an increase in yield that has since been documented as a 20% improvement.
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　　Alstroemeria, also called Peruvian Lily, Lily of the Incas, or Parrot Lily, is native to South America yet has become a popular flower around the globe. We covered the start of the Together2Grow trial back in the spring when Plessey announced several horticultural lighting trials including one focused on tomatoes. In each case, the tests are being focused on SSL as a supplemental energy source for the plants.
　　The control area of the trial relied just on the existing HPS lighting that delivered photosynthetic photon flux density (PPFD) of 70 μmoles/m2/sec. For more information on metrics such as PPFD, see our previous horticultural lighting feature on the topic. The SSL trial area used Plessey Attis 7 fixtures alongside each 1000W HPS fixture. The supplemental lighting increased PPFD to 130 μmoles/m2/sec.