PAR meter hack $30 | Measure PAR accurately with a with cheap Amazon Lux meter

CORRECTION: The conversion factor is off by 1 decimal point e.g. please use 0.025 instead of 0.25. ALSO the 881E model range is 0 to 300,000 lux. Sorry for the confusion. Shane


I have calibrated a cheap Amazon Lux meter to a professional PAR sensor, the Apogee SQ500. .
The results are very predictable up to 40,000 lux or about 1,000 PAR for the different spectrum samples of white LEDs and HID grow lights.
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THIS WILL NOT BE ACCURATE FOR BLURPLE OR OTHER SPECTRUM NOT TESTED.
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The meter is widely available on amazon and is called the 'AP-881E Digital lux meter, range up to 400,000 lux' and costs about €30.

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