Technologies used for plant lighting
HPS stands for High Pressure Sodium
CCFL stands for cold cathode fluorescent lights
This technology is mainly used now in lower power density applications like in indoor plant lighting systems, racks for tissue culture and cloning, aeroponic growing systems. Its advantage is quite high LPW efficiency, low heat generation, longevity. A decade ago, there were attempts to use CCFL lights as intercanopy lighting, however they proved this technology is not a good choice.
As we can see, the CCFL grow light spectrum is quite poor and a lot of light also lies in green-yellow part, so it is not perfect for plants.