R:FR ratio Archives - All Things Lighting® Association https://www.allthingslighting.org/tag/rfr-ratio/ Illuminating the Complicated! Mon, 16 Oct 2023 06:54:24 +0000 en-US hourly 1 https://www.allthingslighting.org/wp-content/uploads/2023/08/cropped-ATLA-favicon2-32x32.jpg R:FR ratio Archives - All Things Lighting® Association https://www.allthingslighting.org/tag/rfr-ratio/ 32 32 The Effect of Near-Infrared Radiation on Plants https://www.allthingslighting.org/the-effect-of-near-infrared-radiation-on-plants/ https://www.allthingslighting.org/the-effect-of-near-infrared-radiation-on-plants/#respond Mon, 19 Apr 2021 09:00:25 +0000 https://www.allthingslighting.org/?p=1945 Look at any textbook on botany and you will find this maxim: plants respond to optical radiation in the spectral range of 280 nm to 800 nm. Period, end of discussion. The question is, how was this spectral range (sometimes referred to as Photobiologically Active Radiation, or PBAR) determined? This question addresses issues beyond mere […]

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]]> https://www.allthingslighting.org/the-effect-of-near-infrared-radiation-on-plants/feed/ 0 Far-Red Lighting and the Phytochromes https://www.allthingslighting.org/far-red-lighting-and-the-phytochromes/ https://www.allthingslighting.org/far-red-lighting-and-the-phytochromes/#respond Thu, 14 Nov 2019 23:06:22 +0000 https://www.allthingslighting.org/?p=1241 Ian Ashdown, P. Eng., FIES, Senior Scientist, SunTracker Technologies Ltd. Published 18/06/04. Most LED grow lights feature blue and red LEDs whose peak wavelengths – approximately 450 nm for blue and 660 nm for red ­– have been chosen to coincide with the spectral absorption peaks of chlorophyll A and B molecules. In doing so, […]

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