While not used for photosynthesis, ultraviolet (UV) and infrared (IR) wavelengths of light energy are involved in photobiological reactions in plants, meaning they are essential in plant growth. More advanced growers should know their lights’ UV and IR output. Where PAR covers 400nm-700nm, the visible light spectrum used for photosynthesis, PBAR covers 300nm-800nm, which includes both UV and IR wavelengths. More and more research has been coming out on the benefits of using supplemental UV for increased resin production. Most growers know that red light is needed for a good flowering response. Light in the far red range increases photochromic responses and is involved in flowering. Many studies show that when plants get 660-680, deep red, and 680-730, far red, they show an increased flower production. Manufacturers have responded to the research, and we are starting to see more and more lights including these UV and IR enhancements, as well as specialty lights such as horticultural UV, grow light bulbs, and far red LED strip lights, so it only makes sense that we are starting to hear more about PBAR.
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