What’s your thoughts on this? do you think this would be sufficient ?
Photone is free and also measures the 400nm to 700nm range.
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Thank you 
TLC has you going in the right direction. I own the same one and my grows have gone off the charts since I got it. Lets you really dial in your lights!
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Watched this video. Interesting. Hope this works
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I’m shopping for meter, this might change my mind. Gonna research on the the app
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Hows the app work on Android systems???
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If one does not have a PAR meter to verify the Photo-Phone app, you can’t really know that the readings are accurate. This paper vs that paper. Are the different batches of paper the same in terms of light transmissibility? The paper manufacturers don’t test for that.
My PAR meter was some of the best money (north of $300) that I have spent. That and lights which I would not have known to purchase if I had not purchased the PAR meter to tell me how deficient my lighting was.
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How much does a reasonable quality light meter cost?? I see cheep cheep 10/40.00 range on Amazon but that seems too cheep! Not sure i even need one but…
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The video is of the cheaper 150.00 vs apogee.
Quality calibration requires a better sensor than my samsung. It measures ambient light, ambient light is visible to the human eye.
Quality light sensors use cosine-law, in short reflective material in surroundind grow room will give different measurements from different areas, imo, no ambient light sensor can do that and be visible to the eye.
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That makes sense could i assume photography light meter would be the wrong sensor as well???
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Cameras can have multiple sensors at work, depending on the cameras uses. I would say more sensitive sensors used in photography than a cell phone.
The video guy did his test with paper on his top screen on the phone to get accurate reading using the app.
Never read that when using the app, maybe why it never worked.