ezenzyme said:

Well cuz no one has mentioned the usual. What is your water source? Are you using Cal Mag? Is your coco buffered? First run in coco?

lights are easily solved with a par app downloaded for any smart phone.

have ya read this thread? it should be your bible

HOW TO WATER COCO FOR BEST RESULTS.

Ok writing this cause i see this issue often and rather have a thread to link than explain this each time. This is not my work but a collection of info from many members here and I have put into practice myself. So first off COCO is NOT soil. For best results we want to keep it saturated...

www.thcfarmer.com

heres a good thread that you should check as well;

Is this a sign of Ph problems? Or light burn?

I’m also totally against advising anything other than ro myself personally I’ve seen and had too many problems when starting with other water sources.

www.thcfarmer.com

and from what i have read right off the bat;
you need imput and out put Ph and PPM to figure out what the Rootzones approx ppm and ph are
you want to water multiple times daily with cal mag in EVERY watering

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Dirtbag said:

I've never used Calmag in coco once, always had awesome results. Calcium uptake can be adjusted 6 ways from Sunday without resorting to the old Calmag tonic.

I agree though that good starting water is very important. Usually either quality purified tap water or that mixed with RO, or lakewater, or rainwater. As long as it has some alkalinity its usually good to go.

If you want to get enough calcium, increase transpiration rates, use a quality fert that has enough calcium in it, and use decent starting water. It's really that simple. I've grown in all kinds of different media and haven't used calmag in over 15 years. If anything I'll use a little calcium silicate or liquid calcium carbonate to bump the starting water. But "calmag" has always struck me as a snake oil cure all.

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ezenzyme said:

@Dirtbag when growing in coco thats not been buffered you have gotten away with just using a balanced fert that has Ca in it?
Cal mag is totally snake juice and cal mag deficiency is not a real thing BUT when in coco your using the cal mag for the dirt not the plant.

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Dirtbag said:

What style reflector are the lights in? If its a batwing type with horizontal lamp position, 14" is WAY too close for plants this size. I'd have it 24-36". But I'd also seriously suggest switching to MH if you can swing it. I'm not sure I would go by the light meter, at this stage I think you're better off reading the plants.

Drooping leaves if not overwatering is usually from too much light.
Praying leaves that stick almost straight up are looking for more light.
Leaves that stick straight out or pointed very slightly upward are in the money spot in terms of light intensity.

Trust me, disregard your chart and raise the light to ~30" from the canopy and feed 2 or 3 times a day. Things will get better.

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Jonnypierce said:

Hiya pal just a quick one but my other mh bulb is coming tomorrow and I'm gonna switch the bulbs over, the question I've got is do I keep the lights the same distance away ?

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