Zkittles light sensitivity? The nature of LED lighting?

photone is no guarantee... as long as the characteristics of your light are near enough to the stock factor calculation they are using... it'lll be okay. What you can use it for is relative intensity... 90% of what you read before will be 90% of actually ppfd (whatever it was), too, so it is proportional. Those apps are like a TDS meter... a TDS meter does not measure PPM... it measures EC and divides by .5 or .7 or .. think there's a third possibility depending on manufacturer and region. The photone app i slikely taking a lux reading, because that's all a phone can actually do, and then applying some stock calculation to provide you with a false ppfd value. because the led lights are much more similar now, the error will be smaller, at least. you cannot measure ppe without a real piece of scientific equipment. your phone absolutely cannot measure photons individually or in any direct way that results in accurate measurments. Now, genetics do play a role, but the larger factors to consider are your environment. Temp, RH and atmospheric co2 will dictate how much light your plant can handle. the temp and rh also dictate how fast it drinks to match that new potential with extra available co2, or it will be in some part wasted. Light burn symptoms are pretty obvious when they start... if you see them, react of course... but don't assume that the plant can handle the same exact amount any particular day if the other factors are wobbling. it can't. it's all relative, baby! 1100ppfd, which isn't ppfd, if it's a measurement in "1" spot. PPFD is the average per m^2. so you'd have to take measurements in several locations and average them out to determine what you are provider per your area. it's easier to just take the umol/s your light produces, if proper spec sheet which cna be rare, and convert from your umol/s per area to umol/s per m^2 then reference a DLI table... that will be apples to apples in that regard. A DLI 35-40 is probably safe, but also could be the start of the "danger zone" it's not a line in the sand.. it becomes a progressively worse context at some point, though. that "point" fluctuates with environment as well as genetics, but less so.. these plants evolved being pelted by too much light. if there's soem volatility here it's probably due to lack of foresight with breeders.. .cause that would be a stupid trait to allow to persist or amplify.