Need help diagnosing leaf spotting / burn on autoflower – Day ~31 flower

Looking at the setup and the photo, those upward-curling leaf tips combined with the lighter lime/yellowish hue point pretty clearly toward a combination of mild nutrient burn (nitrogen/hot spot) and some light stress given that 30 cm distance at 80% intensity. * The Light Factor: At 30 cm with the dimmer at 80%, depending on the specific LED fixture, that's getting pretty intense for day 30 of bloom, which can cause the leaf margins to taco or curl upward as the plant tries to transpire faster than it can keep up. * The Nutrient Angle: The tip burn (clawing/crisping right at the very ends) usually flags a touch of excess salts or a heavy feed. Since you're mid-bloom, they're hungry, but if your medium is getting a bit hot or concentrated, it'll show up right on those tips. * Next Steps: I’d back the light off a bit—either raise it a few centimeters or dial the dimmer down to around 60–70% to give her a breather—and make sure your next watering is plain pH-balanced water to help flush out any built-up salts in the root zone.

Yeah, looks like too much light is th eprimary cause of the chlorosis up top with skinny fingers. read up on DLI , calculate it based on specs of light... umol/s PAR needed is inversely related to hours of operation... lights usually make recommendations for coverage based on 12 hour operation needs. A light well-sized for a 3x3 tent, for example, needs to be run around 67% over 18h and 100% over 12. it's the same dli. Can't assume the light is a perfect fit, but helps understand what common sense is in regard to it.

The whole plant looks quite light green overall, and the top seems a little lighter than the lower part. Light intensity is worth checking, but I wouldn’t rule out a nutrient or uptake issue either. If you can share your light model, PPFD at canopy level, medium, pH/EC, feeding and temp/RH, it’ll be much easier to help you properly

Good afternoon, It’s probably due to the proximity of the light to the leaves, but it can also be caused by low humidity.... I believe the humidity levels are low, but without more information, it's hard to be certain....

This is primarily light burn combined with mild nutrient burn from keeping the light too close. Raise your lamp to 40-45cm and water with pH-balanced water to fix it.