Forum for Illumination Research, Engineering, and Science (FIRES)

Standards Category: Horticulture
Figure 1. Typical HPS lamp spectral power distribution versus McCree curve.

Specifying LED Colors for Horticultural Lighting

By Ian Ashdown, Senior Scientist SunTracker Technologies

Whereas human vision relies on five opsins as photoreceptors, most plants have a wide variety of photopigments that are responsive to optical radiation from 280 nm to 800 nm. Beyond photosynthesis, plants rely on this radiation to control photomorphogenesis, phototropism, shade avoidance, and both circadian and circannual rhythm entrainment.

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