I just got some lights that have been reviewed enough to make me think that the seller's ppdf's are close enough to work with. I measure less that half that number with Android Photone on my Samsung Tab S4. Sure, I can calibrate my tablet based on what I have but that makes me question whether I didn't have enough light before the new ones... I don't really have a question (and I got much better light now) but I read some old threads on Photone here so I thought I'd throw some more info into the mix.
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Last edited by 90Gizmo; 05-20-2022, 08:17 PM.Drying: Strawberry Cough photo started indoors Apr 27. Moved outdoors June 25. Harvested October 8.
Past grows: Speakeasy Bourbon Berry Auto F1 (Ogreberry x Whiskey Zulu),
Whiskey Zulu, Trizzlers -
What does the app show outside on a bright sunny day at noon? Last phone I had topped out at a third actual value compared to my LUX meter. -
Greetings @90Gizmo,
For what it's worth, I have found PhoTone on my iPhone to be really accurate without any additional calibration. I compared the published specs for my ViparSpectra XS 2000 lights with phoTone readings at 12" & 18" and they were an almost perfect match. I also compared the PhoTone DLI readings with the calculated values based on PPFD and 12 hours of light and they were close enough to inspire confidence.
-GrouchyMy goal is epicurean quality rather than high yield.
I'm learning how to create cannabis tinctures and hashish and I almost always use a vaporizer to spare my aging lungs.
Despite my avatar name I'm generally amenable and helpful. So, if there's a question I'm qualified to answer, hit me up!
-GrouchyComment
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grouchyoldman, you got me thinking to try a different phone. My old LG V10 read 840 against the expected 1000. While low, it's within the expected error range according to the Photone web site. I also saw that way all the way right is a source type for "Sun" that I had missed so my previous reports on noon Sun readings are invalid. I'm not expecting noon Sun again for a few days. I'll post back when I can. Maybe I can dig up a few more phones. -
Hi @90Gizmo,
I was most interested in comparing PhoTone readings with the published PPFD maps of various LED fixtures under controlled distance conditions. I was blown away by the accuracy, precision and repeatability of the PhoTone meter. I originally used a lighter gauge paper for the Diffuser, but once I got that right I came to trust the info from this app. I use it all the time now as the grow conditions change, especially during the flowering stretch.
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