BehindEnemyLines
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I have a MQ 610 also. I bought an Apogee SQ-420X ($234) and compared the two units against each other.10 nmols is the threshold. Then look at the levels of light below that as he demonstrates. Even with the cell phone screen and a small power led on there is not enough light to effect the plants. So it's more than safe to say a light leak in a tent or light coming under or around a closet grow door is not harmful as long as you can't read by it in basic terms. The idea we need and must have blackout is not true. He goes on to mention color of light in basic terms, NLI and temperature. And while I'm grateful to have a MQ-610 for reading my PPFD no way I'm going to go buy a light pollution meter or honestly worry about little light leaks.
The Apogee SQ-420X with the “Immersion Setting” turned on, I was getting almost the exact same readings as my MQ-610 under several different LED lights with different color spectrums. I was really shocked as the results considering the upfront cost of the SQ-420X at $234 vs. the MQ-610 at $568.
Certainly take my findings with a grain of salt, but I was very impressed. I posted a thread about it in the LED lights section.