In 1972, a very well-respected physicist, crop physiology expert and doctor of technical optics definitively mapped how a plant processes photons during photosynthesis. This map proved that plants use photons in every frequency (color) of visible light to produce sugars and therefore energy, for a plant to thrive. This came to be known as the McCree Curve (Dr. Keith McCree), and is the authoritative reference on measurement of light as it affects plants, commonly known as Photosynthetically Active Radiation (PAR) (Fig 1).
We strive in all our designs to faithfully reproduce this curve. In doing so, we are able to deliver more life-giving and usable photons than other technologies, including competitor’s LED grow lights and High Intensity Discharge (HID) lighting, such as HPS (High Pressure Sodium).
It is a common misconception that for photosynthesis purposes, plants use only light in a few red and blue frequencies. You have likely seen LED lights being sold that follow this theory they show as pink or purple light in photos. Clearly, based upon the PAR research shown, over 10 years of research in our labs, and thousands of satisfied customers, this is not the case.
While getting the frequencies correct is certainly a major factor in our light’s success, there is a lot more that goes into building a quality LED grow light.