New Grower Light stressed, bleached plants?

[musicvoyager]

I am on day 17th of my growing, and I have started noticing some white spots on the leaves of my plants. It looks to me like it is due to too much light. Anyone has any other opinion?
I am growing with 340W LED and worm castings, and the distance from the lamp to the top of the plants is probably 70 cm. I cannot increase this distance, so it looks like probably I need to change to T5s. Bummer, because I really dig this light, amazing growth.
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[vv15629]

I don't see white spots. Either way its not from lights

 

[musicvoyager]

Not easy to see, but in the second picture you can see a white mark on the tip of one leaf. Third picture shows some de coloration, and fourth picture a white spot as well. All on the same plant. Other plants are starting to show this marks too, but difficult to see it on a picture. I am afraid it will become something like this http://www.growweedeasy.com/heat-light-stress Probably I am being paranoid.

 

[low_and_slow]

Heat stress causes upward leaf curl. Your plants look very dark green, almost bluish...if you're fertilizing, maybe dial down like 10%. Otherwise they look totally kickass!

 

[JM]

doesnt look like anything to e either... but have a read through this... :

https://www.autoflower.org/f7/spider-mites-ipm-integrated-pest-management-12529.html

 

[musicvoyager]

Heat stress causes upward leaf curl. Your plants look very dark green, almost bluish...if you're fertilizing, maybe dial down like 10%. Otherwise they look totally kickass!

Thank you for the compliment, I am extremely happy, after many failed attempts trying to grow outside. No fertilizers, only worm castings.

 

[musicvoyager]

doesnt look like anything to e either... but have a read through this... :

https://www.autoflower.org/f7/spider-mites-ipm-integrated-pest-management-12529.html

No, it certainly doesn't look like a bug. It's just some discoloration. Probably they've got hit? the fans blow pretty strong

 

[JM]

Heat stress causes upward leaf curl.

so can too much direct fan blowing... so maybe give it a little direction shift so its circulating air but not necessarily blowing directly at them hard.

 

[musicvoyager]

so can too much direct fan blowing... so maybe give it a little direction shift so its circulating air but not necessarily blowing directly at them hard.

It's something I have pending. When I bought the fans I didn't expect them to be that powerful. I will mount them on the side, just waiting for the brackets to arrive.

 

[Muddy]

If it were bleaching it would start on the top most leaves and would work from the center of the leaves outward toward the tips. I think you're seeing the early signs of over fertilization given the deep green color of your leaves and the fact it is starting on the leaf tips. What have you been feeding them and at what strength?