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help me plz. light burn or nut?

Nurse
Nursestarted grow question 4 years ago
I have two lights, spider sf 1000 and viparspectra p1000. My plants have burn marks. I do not know if it is from lights or fertilizers. I now keep them 18 inches apart. Can anyone tell me the light distance table? How far should they be now?
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Nurse
Nurseanswered grow question 4 years ago
Thank you. I added a few photos to my profile in this regard right now in the fourth week. It may have been a physical injury when I was training them. But the leaves on the plant start to turn yellow from the tip. I do not add fertilizer to the water, however, the ppm of the city water is high pH 6.8 ppm 400 500 and Ranf pH 6.2 and ppm 2000. Can someone tell me with what pH to water them so that the ppm of the pots comes down? The lights are at 45 cm
Autoflowerdummy
Autoflowerdummyanswered grow question 4 years ago
If your looking for a light formula chart check out dr.coco he has a great one. But I don’t think it’s either. Looks more like a damaged leaf.
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PurpleWorship
PurpleWorshipanswered grow question 4 years ago
Looks more like a damaged leaf. Like mechanical damage. Not light or feeding in my opinion. So Option 1 : a bug (caterpillar?) / Option 2 : She been stuck during it's grow, and it's not a real problem. Check if you have other leaves that look like that. Did you saw the leave in perfect condition before this?
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HighAltitudeOrganics
HighAltitudeOrganicsanswered grow question 4 years ago
If you’re referring to the tips that’s from nute burn. What is your PPM when feeding? What is your pH when feeding? What type of water are you using? What are your air temp and humidity? This will help narrow down beyond just saying nute burn
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