The Planted Tank Forum - View Single Post - Convert Lux meter to PAR meter?
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Old 06-18-2012, 04:08 AM   #31
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Originally Posted by mistergreen View Post
It won't necessarily be a match. The voltage output may vary from diode to diode so the readings will be off even though they read the same spectrum.
Since I have to calibrate it anyway, that doesn't bother me. I was concerned that it simply wouldn't work at all. I notice that the "cathode" is identified on the diode case. Is that the one that the negative polarity wire is soldered to? And, by convention, is the white or red wire the negative one? One last question, if it is connected backwards does anything happen other than it just not working?

End of today's photo electronics lesson for me
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