Light Measurement
PAR Meter and PPFD Measurement for Grow Lights
A PAR meter helps growers measure usable plant light at canopy level. It is one of the most practical tools for verifying LED grow light layout and intensity.
Quick Answer
Use PPFD readings to understand what plants actually receive.
Fixture wattage tells you power consumption. PPFD tells you how much photosynthetic light reaches a specific point on the canopy. For commercial growers, PPFD mapping is more useful than guessing by eye.
How to measure PPFD
| Step | Action |
|---|---|
| Set fixture height | Use the planned mounting distance. |
| Warm up lights | Measure after output stabilizes. |
| Create a grid | Measure center, edges and corners of the canopy. |
| Record dimming level | PPFD changes when fixture output changes. |
From PPFD to DLI
DLI combines light intensity and time. Once growers know average PPFD and daily operating hours, they can estimate total daily light for the crop.
Agrilumia support
Agrilumia product planning focuses on PPF, efficacy, spectrum and layout. For projects, measurement data can help fine-tune fixture spacing and dimming schedules.
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