Converting Lux to PPFD & Measuring Lux with Smartphone

by Horticulture Lighting Group Canada

Spectrometer and Quantum Sensor can cost hundreds to thousands of dollars and not every grower can afford them. A Lux meter app on phone can be used to ensure even light spread across canopy and give estimate of Lux. Use a calibrated Lux meter for better accuracy. Just divide the Lux value you are getting with the Lumens/PPF ratio to get the PPFD value. Use calculator at the end of this page.

This guide gives an estimate for converting Lux to PPFD. Data used in this calculations is from independent lab reports or spectrometer. The converted PPFD data will be accurate if the entered Lux data is accurate.

Version

Lumens*

PPF* Lumens/PPF
QB 288 V2 Rspec 81138.43* 1256.92* 64.55337
QB 648 Diablo 55825.85* 911.36* 61.25554
QB 288 V2 3000K 80833.17* 1178.05* 68.61607
QB 288 V2 4000K 13421* 193* 69.5388
QB 96 Elite V2 53840.87* 810.44* 66.4341

*Use for reference only. Every Board spectrum may be slightly different. Board temperature and Phosphorus aging also change spectrum causing Lumens/PPF to shift over time.

LIGHT INTENSITY REQUIREMENTS

Seedlings, Clones Under 100 PPFD
Veg, Greens 150 PPFD - 400 PPFD
Extended Veg with healthy plants 350 PPFD to 500 PPFD
Flowering, Fruits 400 PPFD to 800 PPFD
Flowering with Supplement CO2 600 PPFD to 1100 PPFD

Chart is for reference only. Plant response may vary due to plant types and environmental conditions.

Calculator For QB 288 V2 Rspec

Enter Lux Value :

PPFD:

Calculator For QB 648 Diablo

Enter Lux Value :

PPFD:

Calculator For QB 288 V2 3000K

Enter Lux Value :

PPFD:

Calculator For QB 288 V2 4000K

Enter Lux Value :

PPFD:




Horticulture Lighting Group Canada
Horticulture Lighting Group Canada

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