Our team trialed different light sources of varying intensities and spectrums over a 3 year period before identifying the ideal light source to support plant growth while conserving energy use.
We found that, in respect to the light source (bulb), the key considerations are proper light spectrum and light intensity. Plants tend to respond to blue and red wavelengths and in proportion that is not available from incandescent or typical office-type LED lights. We found that the LED grow lights available on the market primarily were composed of red and blue diodes and supported healthy plants. However, they cast a purple light which looks odd, unnatural and unattractive. Most LED grow light options were also difficult to find in fixtures that would allow for lighting of a vertical surface.