PPFD RSS

absorption spectrum, Chandra, chlorophyll a, chlorophyll b, CO2, grow light, horticulture, light absorption, PAR, photosynthesis, PPFD, zenith LED grow lights -

Words and images by @SuperFunker. How 'high' must Photosynthetic Photon Flux Density (PPFD, µmol/m2/s) be to induce peak photosynthesis in Cannabis? In 2008, Chandra measured a maximum rate of photosynthesis at 1,500 µmol/m2/s. In 2015, Chandra conducted a similar assessment and measured a maximum rate of photosynthesis at 2,000 µmol/m2/s. So, problem solved... right? Not necessarily. Chandra, 2008. Chandra's 2008 Cannabis analysis is a two part study. First, he measured the photosynthetic response to a range of light intensities at various temperatures. The light and temperature combination that produced peak photosynthesis was then applied to a series designed to gauge...

Read more

absorption spectrum, chlorophyll a, chlorophyll b, grow light, horticulture, light absorption, PAR, photosynthesis, PPFD, zenith LED grow lights -

Words and images by @SuperFunker. Part 3, PPFD Photosynthetic Photon Flux (PPF) is the total amount of Photosynthetically Active Radiation (PAR) emitted by a light. Measured in micromoles per second (µmol/s), PPF provides a general understanding of a light's full output, but it does not measure the photons that actually reach your specimen. To rationalize the true utility of natural and artificial light, the Horticulture Industry relies on a narrow interpretation of photon delivery by gauging Photosynthetic Photon Flux Density (PPFD). Expressed as micromoles, per square meter, per second (µmol/m2/s), PPFD is an evenly weighted measurement of PAR that falls...

Read more