At Guelph Article Research Shines a Light on Greenhouse Plants

LED lights are more energy-efficient than standard greenhouse lights. Prof. Youbin Zheng, Environmental Sciences, is studying how different coloured LED (light-emitting diode) lights affect the growth of plants in greenhouses.

In case you haven't seen this: http://atguelph.uoguelph.ca/2014/12/research-shines-a-light-on-greenhouse-plants/