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LEDs in spotlight - Greenhouse Canada<br />

treatments. When light colour effects are better understood, growers will be able to avoid unwanted sideeffects<br />

and to use LEDs <strong>for</strong> accurate control <strong>of</strong> how plants grow, develop, flower and produce.<br />

LED systems: There are some special requirements <strong>for</strong> application in greenhouses: right spectrum, waterpro<strong>of</strong>,<br />

robust, reliable, stable and causing minimal shading <strong>of</strong><br />

natural light.<br />

One <strong>of</strong> the treatments in an experiment at Wageningen University in Bleiswijk features a combination <strong>of</strong><br />

HPS and overhead LED lighting.<br />

Two examples <strong>of</strong> specialized horticultural LED systems are: Philips GreenPower LED and Lemnis lighting LED<br />

modules. Lemnis LEDs have water-cooling. Both manufacturers provide custom-made solutions (light colour,<br />

light level, number <strong>of</strong> LEDs, dimensions). Systems are available <strong>for</strong> assimilation lighting, multi-layered<br />

cultivation or cyclical lighting. New modules are being developed continuously.<br />

The future: Knowledge on LEDs has increased rapidly in the last three winters, but new questions arise all<br />

the time about the finer art <strong>of</strong> growing under LED lighting. In a later article we can summarize the<br />

conclusions <strong>of</strong> in-depth research done in the Netherlands on growing tomatoes under LEDs.<br />

LEDs can have a bright future if their efficiency increases and the price comes down, and if scientists<br />

continue to gain new knowledge, and growers learn more about how to grow best with LED light.<br />

Page 4 <strong>of</strong> 4<br />

Elly Nederh<strong>of</strong>f (PhD), CropHouse Ltd, New Zealand, Elly@crophouse.co.nz , is a consultant <strong>for</strong> greenhouse<br />

technology and guest scientist at Wageningen University and Research Centre in the Netherlands.<br />

http://www.greenhousecanada.com/content/view/2941/153/<br />

Appendix BCUC IR1 83.4.1<br />

24/09/2012

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