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Par Maps + Optimal Intensity

Optimizing PPFD Targets: Illuminance Maps for Improved Results

The following measurements serve as recommended PPFD targets for your grow environment. All readings have been carefully taken within a 5' x 5' tent to minimize light reflection, a common occurrence in 4' x 4' tents often used by other manufacturers. When using multiple lights, please note that actual readings may register higher due to light overlap. Conversely, within a 4'x4' space, the edges are enhanced thanks to the reflective walls.

Mammoth's Recommendations:

  • Vegetative Stage: Aim for PPFD levels between 600 and 900.
  • Flowering Stage: Target PPFD levels ranging from 1100 to 1800 and lower the last 2 weeks
  • For advanced CO2 users and professional growers, consider aiming even higher.

These recommendations are grounded in extensive research, drawing from third-party academic studies and Mammoth Lighting's own trials. It's crucial to understand that achieving these targets also requires fine-tuning your environmental conditions. It's worth noting that academic studies have shown a linear relationship between light intensity and hemp yield, with significant benefits observed up to approximately 1800 PPFD.


Cannabis Yield, in almost all academic studies, is linear to light intensity up to ~1800 ppfd (and potentially higher).


"If you want to maximize yield you need to push it hard with light"...Dr. Bugbee Utah State 


Highbay / Greenhouse Light