One of the general facts of life is that technology is always advancing. And this is still true of LED grow lights which continue to improve, thanks to the continuous advances made by LED manufacturers such as Osram, Samsung and Cree. When these advances are diligently used in the design of a grow light, they bring us more light for every watt that they consume, which means bigger yields, less heat, and lower running costs for the end-user.
The SANlight Q6W brings us pretty much the highest level of efficiency that is currently possible from an LED grow light. The efficiency of a grow light at turning electrical power into PAR light is measured in µmols/Joule. Please see the last section of this article for an explanation if you are interested in the science. It goes more into depth about what µmols/Joule means, and what one actually