Redefining PAR: The impact of far-red photons on photosynthesis

Added on 02 October 2024

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Redefining PAR: The impact of far-red photons on photosynthesis

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The effectiveness of far-red photons in driving photosynthesis means that technologies utilizing these photons, such as downshifting luminescent materials and fixtures that include far-red, should be reevaluated for their effectiveness as plant growth spectrum providers.

Traditionally, photosynthetically active radiation (PAR) has been defined as the range of light wavelengths from 400 to 700 nm, based on the minimal photosynthetic activity of photons beyond 700 nm when applied alone (Emerson & Lewis, 1943; McCree, 1971). However, emerging research suggests that far-red photons (700 to 750 nm) significantly synergize photosynthesis when combined with photons within the PAR range (visible light).