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A blue tooth one would be better. For me anyway so you could pair it with your phone. wouldn't have to have a laptop near water. But I imagine they'd put a long lead on it.
It is the same as when a conductivity meter gives you a reading in "ppm TDS" it hasn't measured TDS, and in this case the DIY meter has just use a conversion factor from the light in lumens that it measures.
You can show this really easily by measuring a grow-light with red and blue LEDs with this type of PAR meter.
Because red and blue LEDs don't produce any white light the meter will tell you that the fitting doesn't produce any PAR, which definitely isn't true.
Apogee Par meters cannot be used very well with narrowband LEDs either and they even say so on the website, there are quite large errors especially with blue LED's.
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