A New IES Standard Blooms

The IES has introduced ANSI/IES RP-45-21, Recommended Practice: Horticultural Lighting, to describe the differences between architectural and horticultural lighting design. Included in the Lighting Applications Standard Collection and published in consensus by the IES Horticultural Lighting Committee, the document is paramount for lighting professionals interested in designing atria, greenhouses and indoor farms. Horticultural Lighting Committee Chair Ian Ashdown explains, “Horticultural lighting is a science in its own right—bridging horticulture, botany and illumination engineering.

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