Not sure if this is minor heat stress or something else

Hey guys, big fan, first post.

Got my first lady growing well and checking to see if this is an issue i need to correct. Theres some minor cloudy discoloration on a few of my fan leaves and i wanted to consult the experts. Indoor grow, 3 gallon smart pots, vanilla kush from barney, 600 watt mh at 75% on the ballast. 18/6 light, watering every 2-3 days with the knuckle and weight test. Soil is fox farm ocean cut with non soil potting mix (perlite, verm etc) to assist w drainage. The light is 1 foot from the top of the plant. Im at 4 weeks since planting, temps float 75-80 during light cycle, 65-70 for dark and 50-60 RH. Pics attached, throw me some shade!

Ya, could be right. It could be light damage. One foot is too close for the light. Get it higher up and see if it stops. You wont hurt anything trying anyway. Id try two and a half feet at 100% thatll give it some room to grow and shes big enough to handle 100% of a 600 at the right height from the canopy.

Gotcha raised up another foot and change. Tent temp is about 81, i prefer to keep it around 77 but im not too worried. Past 85 is when to worry yeah?

Mr.Business said:

Gotcha raised up another foot and change. Tent temp is about 81, i prefer to keep it around 77 but im not too worried. Past 85 is when to worry yeah?

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*head nod

Ninjabowler said:

Ya, could be right. It could be light damage. One foot is too close for the light. Get it higher up and see if it stops. You wont hurt anything trying anyway. Id try two and a half feet at 100% thatll give it some room to grow and shes big enough to handle 100% of a 600 at the right height from the canopy.

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Anybody else to put their 2 cents in, ideas, agreeing etc?

Mr.Business said:

Anybody else to put their 2 cents in, ideas, agreeing etc?

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Its a root pathogen. I have some on my plants.
Only my Amnesia Haze and Buddah tahoe have it but its pretty noticeable.
I have not noticed it doing any bad.

For your first post I must say this turn your bs filter on some peeps here are experts others are not

make the right choice

Mr.Business said:

Gotcha raised up another foot and change. Tent temp is about 81, i prefer to keep it around 77 but im not too worried. Past 85 is when to worry yeah?

Click to expand...

Nice. Here, i found this for you, read it.

Mr.Business said:

Gotcha raised up another foot and change. Tent temp is about 81, i prefer to keep it around 77 but im not too worried. Past 85 is when to worry yeah?

Click to expand...

See where he says one foot is max lumens? And your thinking, thats what im doing, ninjas a moron. Well then right after that he says raise it up and let the plant grow into the light. Thats the right way to roll. You dont want to be constantly moving your light with the plants growth. Wrong way.
And ya, 81s fine. 85s ok, 88 is bad. The hotter it is, the more the plant will stretch also. Im guessing your in a place with forced air ac and windows? It should be cold where you are, crack a window if it gets bad. Or turn your thermostat down five degrees in your place. Itll help. Another solution is running the lights at night. Its usually hotter in the day time and cooler at night. So run hot lights at night.

And put some pullys on your light that way you can always be at max lumens easy my bad forgot hes runnin hot lol im faded

During one of my first grows, I had similar issues. I thought I was over watering and thought I had heat stress, so I waited for the soil to dry, and adjusted temps. Thing is, I tried just visually determining the moisture content. For 20 days I was actually UNDER watering. Even when I watered, it seemed the d/o content was low. I had a little N burn, but the problem was solved and within 10 days the plant was well into recovery. Just needed more highly oxygenated water.
I can't be sure, but thats what I am seeing. If leaves are brittle, then I'm sure.
Otherwise could be nutes, light heat/intensity, or wind.