Light burn?

Zweibel
Zweibelstarted grow question 6y ago
I noticed the tips of the top leaves are becoming paler, even slightly yellow. Could this be light stress/burn? My LEDs were approx. 30 cm from the canopy, now moved them up 15 cm.
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Week 5
Leaves. Color · Yellow
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OimRausch
OimRauschanswered grow question 6y ago
Servus Zweibel, I think Sanlight is suggesting around 40cm in bloom. I myself have the Q4 and the Q6 1st Gen. and I never come closer than 40cm to my damsels. I'm not sure if it's lightstress, I have a textbook example of lightstress in my White widow diary. So have a peak. Yellow tips seem moore nutrient trouble...🤔 Any trouble with pH shortly? Best of luck, OimRausch ✌️
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Selected By The Grower
GMSgrows
GMSgrowsanswered grow question 6y ago
Hey friend. I'm see a zinc deficiency starting. Now to figure out if your going overboard on the nutes or not enough feed. If your only following the directions on the nute label it would be a little overfed. Or whether it's just your ph a little out of whack..You can look up zinc deficiency. Cheers
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Bloombuster
Bloombusteranswered grow question 6y ago
Hey, buddy! 👋 Yeah, it's because the lamp is too close! You need to know the light intensity to keep the lamp at a safe distance from the plant! 👆 You can measure the light intensity (lux) in the cultivation area above the plant! Download a free app called "luxmeter" from the app store on your smartphone, wipe your phone screen well, and clean it from grease and dirt. The light sensor is located on the screen side, which often rivals individual lux meters. Check the light intensity above the plant. Adjust the lamp height so it doesn't heat the plant to shock levels, but also stays within the lux range. Install the app, and you'll remember me more than once, bro! It'll be like a compass for your lighting! 👌 Effective light intensity ranges, starting from planting the plant: Day 1 (250-500lux) Day 2 (500-1000lux) Day 3 (1000-2000lux) After five pairs of leaves, full vegetation (2000-20000lux) Flowering (20000-90000lux). In theory, the most optimal for flowering is considered to be (45000-65000lux). Try not to go above 90000 lux. Otherwise – 100% problems due to overly active processes in the plant! 👆 Good luck, buddy! ✊😇
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