Supplemental LED Lighting Produces Higher Quality Long-day Perennials

Supplemental LED Lighting Produces Higher Quality Long-day Perennials

Supplemental LED Lighting Produces Higher Quality Long-day Perennials

This LumiGrow study uses LumiGrow LED fixtures, HPS fixtures, and low-intensity flowering bulbs to examine the effects of light quality and intensity on flowering perennial plants in a greenhouse environment. By exploring the effects of different spectral ratios and light intensity with the same photoperiod, we enable growers to influence plant morphology and health while saving energy. The results of the study demonstrated that LEDs are as effective as HPS and flowering bulbs at inducing flowering and generally produce higher quality plants with more branches and flowers. The highest quality plants were grown under 90 µmol-m-2-s-1 of light from LumiGrow LEDs.

The study applied 4 different spectral ratios to 6 different flowering perennial varieties over a 16-hour photoperiod. The results demonstrated that supplying the plants with 50-90 µmol-m-2-s-1 of supplemental light from LEDs produced more compact plants, increased the number of flowers and branches, and often induced earlier flowering. This methodology allows growers to produce high-quality plants while optimizing their lights’ energy usage.

LumiGrow smartPAR™ wireless control software facilitates the development of customized light programs like those used in this study. With a few clicks, you can adjust the ratio of red, blue and green light your plants receive. smartPARTM allows you to apply unique lighting strategies and set specific photoperiods and DLIs for each of your crops without ever stepping foot in the greenhouse.

Authors

Roberto Lopez, Michigan State University, Lansing, Michigan, USA

Anthony Soster, Michigan State University, Lansing, Michigan, USA

Brian Poel, LumiGrow, Inc., Emeryville, California, USA

Melanie Yelton, LumiGrow, Inc., Emeryville, California, USA