Trying to learn new light. I’m not so sure about the accuracy of the photone app on my android phone. I’ve got a little foxtailing going on. Do you think the light is to intense, or genetics? It’s an hlg 350r, and I have it set on half power now. The app still shows dli around 50, so I’m not sure if it’s accurate. Week 8 of 12/12, and figure I’ve got around 3 weeks left.
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@Dexterado old school way is to hold your hand over the top of your plant and if after 5 minutes your hand is not uncomfortable then the light is ok
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It’s led and there is no heat underneath it, but it’s very very bright on full power. I ran it on full power for a couple days, and I think that’s what started the foxtailing? And that’s why I started researching ppfd, and dli.
if you can measure the light intensity you will be better off…if they are showing signs of heat stress with cupping or canoeing then raise your lights…you may try to use the manufacturers recommendations
When in doubt with the photone app. You can always calibrate it to your ppfd charts that are on HLG. The 350r has an independent ppfd on the page. 
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Don’t worry about DLI, just make sure PPF isn’t above 1,000 anywhere
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DLI is a better method to follow.
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Might not be foxing. From the light. What r the temps and humidity levels. Too much heat will cause this also so if ur at half power by the time u hit flower u should be at full power on the light and by now u should be dialing it down slowly.
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I’m running between 79 to 83 which I read is about right for led’s to keep the leaf temp in the range for proper photosynthesis. Humidity is around 35%. It may be genetics. I saw a pic of another pure power plant online, and it looked similar.
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Also, I have found that incorrect temperature and humidity sensor locations can send you down a rabbit hole. The temperature sensor needs to be located in the shade away from any heat producing devices. The humidity sensor needs to be located close to the plants, or both can be in the exhaust air. I hang the temperature/ humidity sensor from a small chain, and drop it down into the plant’s branches.
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The charts you can find on HLG numbers are accurate. And they have calculators on their website. I’ve got 2 350Rs at full blast in my tent about to hit week 3 after flip.
Do you have them at 15”, or higher? So maybe my foxtailing isn’t due to t ouch light, but some other factors. And to be honest, I’m not sure I know how to interpret that chart. Are those ppfd numbers?