Help, got some large brown spots on my leaves

Here's my setup: DWC, under 1000 hps for 5 days now (was 30inches above 3 week old plants from seed. I have since raised another 6 inches in case it was light shock). Using Gen Hydro Lucas formula at 50% strength until plants get a little older, RO water, PH at 5.7.

Spots have been on 2 of my plants (both same strain) while other plants have shown no sign of like symptoms.

Any ideas?

Thanks!

its really hard to tell from the pic, it kind of looks like beginning of a deficiency, but it could be burn spots from water on the leaves, or some other damage. get a clearer shot and we might be able to help. in R/O water im inclined to think its a deficiency.

SCCA said:

its really hard to tell from the pic, it kind of looks like beginning of a deficiency, but it could be burn spots from water on the leaves, or some other damage. get a clearer shot and we might be able to help. in R/O water im inclined to think its a deficiency.

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Ok here's a better pic and some measurements. PH 5.7 us 1687 ppm 849

Looks like you already fixed a deficiency. Bump up the ppm if you have to, but it looks alright now.

Muffy said:

Looks like you already fixed a deficiency. Bump up the ppm if you have to, but it looks alright now.

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Thanks Muffy. I was thinking that as well because the new leaves look good, but just wanted to make sure. I think my main problem was I really underfed the plants before I got them under the big light. I just used the clonex clone solution they were already in for a week or so for the first couple days under the big light, which is super mild. Once the big light got on them, the nutes just were not enough for the plants to deal with 1000 watts. (That's my theory, anyway) Ill keep an eye on them for now. if they continue to get strange, Ill pop back on and pick your brains a little more. I really appreciate the help! Oh, I also added a couple 7000k cfls near my plants to give em a little blue spectrum. I know many think this isn't so necessary, but it cant hurt them.