Grow light over a plant tray
What is PAR?

PAR stands for Photosynthetically Active Radiation. It refers to the portion of the light spectrum that plants use for photosynthesis - specifically 400 to 700 nanometers in wavelength, which includes most visible light.


In simple terms:
PAR = the light plants actually use to grow.

This simulator maps how that light spreads over your grow area, based on intensity and coverage - ideal for planning your setup.

How It Works

Tip: Ideal PPFD for microgreens = 150-250 umol/m2/s


The calculator below tells you the "light dose" your plants receive so you can dial in the perfect setup.

Quick Legend

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Important Note

This is a simplified model and assumes uniform beam spread. For precision gardening, use a PAR meter to measure actual values at plant level.

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Frequently Asked Questions

Still unsure how PAR works or how to use this tool? Browse common questions below.