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PAR is the measure of photons that a light emits. PAR: Another measurement you might run into is photosynthetic active radiation or PAR for short.For plant growth, it is best to expose them to light that is like natural sunlight, something between 2,000K to 7,000K. The color temperature scale is measured in degrees of Kelvin (K) ranging from 1,000-10,000. Kelvin: Color temperature is a way of representing the light appearance provided by a grow light.This is called the visible spectrum, and it is in this range, 380-700nm, that grow lights emit their light.

Nanometers: Most commonly grow lights are measured in nanometers (nm), this measurement represents the amount of light emitted in both visible and UV light.

There are several ways grow light outputs are measured, these include: How a grow light’s performance is measured