Marking on fan leaves. 4 week in flower. Help?

Got 2 plants. In a 60x60x100 tent. 4inch fresh air intake fan and 6inch outtake fan through filter.
Got a 600w digital and was running at 400w but turned upto 600w 2 weeks ago and has been fine and temp average 29 day and 19 at night.
What are these marks? Is it a burn from the light? I did think it might be pushing to run 600w in that space..?

Hi Harry,
I don't think it is a light issue, unless you happened to get some water on the leave in that spot.
look real closely under the leave and see if you notice anything. I don't see any discoloration on lower leaves, and no burning on top of the flower so I really don't think it is a heat issue. I know I've burned mine by leaving some water on a leaf and it burned, because I had my fan off it did burn it.
So not sure if that is your problem or not but I sure didn't see any def. just keep a close eye on things you should be fine. They look good. keep up the good work.


Good Luck Harry.

Pretty sure no water would of got up there mate! I have turned light down to 400w atm. Un sure whether to Carry on feeding as normal :/
Thanks man

You could lay off the feeding for a few days and see what happens, the only thing I was thinking was the burn from water because they look really good other than the one spot.
I was wondering are you using Cal-Mag at all ?
But I really think it was just some freak incident that should be fine.

I am using green planets medi one 4 3 3. And slowly introducing atami bloombastic. I am a bit of a newbie it is only my 2nd grow. My first one was not great.

Well it looks like you're doing a good job, I been using 1,3,2, for years, and hardly ever have any issues, in flower chamber, and 2.2.2 in veg and seems to be less of a problem than every other thing I have tried, and I've tried lots of stuff.

looks like the uv burn ya get on seedlings if there not hardened in. im using a 315 cmh in a 3x3x6.5
thats a 550w equivelent in hps, no problems. there is no interveinal chlorosis on any other leaves so doubt its cal. the necrotic leaves arnt the right color for mag.

Dynamo626 said:

looks like the uv burn ya get on seedlings if there not hardened in. im using a 315 cmh in a 3x3x6.5
thats a 550w equivelent in hps, no problems. there is no interveinal chlorosis on any other leaves so doubt its cal. the necrotic leaves arnt the right color for mag.

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Thanks man what do you advise I should do ?

how high over the plants was the light when you turned it to 600

Dynamo626 said:

how high over the plants was the light when you turned it to 600

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It was about 22 inch away mate

put it at 30 drop it an inch or 2 a day untill your at 18 to 20

At 22 inches is certainly isn't burn from your light, but something weird happened.

I posted a pic of mine you can see some yellow but that is just because they're almost done.

Like I said my light is about a foot away.

Keep us post on your progress....

Bear420 said:

At 22 inches is certainly isn't burn from your light, but something weird happened.

I posted a pic of mine you can see some yellow but that is just because they're almost done.

Like I said my light is about a foot away.

Keep us post on your progress....

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purdy!

Shall I carry in feeding as normal do you guys think?

Your plants look tasty. Still say its light damage. 1 foot is close but not totaly unreasonable. Bet they are not one foot away and one day you just up the wattage 33%

I would. Lil light damage isnt to bad and ya dont wana fight that and a dificiency. But then i have no experience with sinthetic nutes. Im organic

Do you think I am best leaving at 400w now? At about 20 inch ?

More watts is more at harvest. If heat and humidity are under control i would go back to the 600 but i do understand being gun shy! When i go from veg to flower i put my light at max height and let them grow up to the light (abought 4 feet over them) then when the strech is over if i need to i drop to 20 inches ( i judge the strech well and usually only need to drop the light 6 in to a foot)

315 cmh for veg 630 de cmh for flower

Dynamo626 said:

315 cmh for veg 630 de cmh for flower

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Sorry what do u mean by this?
I have put my light back to 600w but moved it 26" away. Temps last night between 27 and 31