IES RP-45 PDF

IES RP-45 – Recommended Practice: Horticultural Lighting

While humans and plants use light in different ways and for different reasons, the fundamental job of the lighting professional for these applications stays the same-deliver the right amount of light with appropriate spectral power distribution to the target at the right time. The amount of light is characterized differently for plant versus human applications. For plants, the amount of irradiation, the timing of delivery, and the total light dose over the course of a day and throughout the plant life cycle need to be considered.
The appropriate spectral power distribution is different for plants and humans-and can vary between plant species (and even between different cultivars within a species). This document describes these differences between architectural and horticultural lighting design, so that lighting professionals will have the necessary information to translate their architectural lighting know-how into horticultural lighting practice.