First grow, some discoloration and waxy appearance on some leaves, having a hard time diagnosing

hey all, exactly 4 weeks into my first grow. currently have 6 plants under 1000w mh dimmed to 50%, about 8 inches over the tops of the plants. Temps dont go above 82, humidity stays betwen 40-50%.
growth has seemingly been okay to me, nice node spacing, steady good growth, but i have noticed a progressing issue with a couple of my plants. As you can see i have some spots on a couple leaves and there is also a dry brittle kind of shiny waxy appearance to some of them too. I first noticed this 2 weeks ago on one plant but now am starting to notice it on 2 others. This doesnt seem to be slowing growth, but none the less i am still concerned. Primarily seems to be on lower leaves but am noticing it on some of the higher leaves now as well.
I started my plants in solo cups with fox farms ocean forest. I just transpanted from solo cups to 1 gallon pots 4 days ago. Plants dont seem to be shocked by the transplant as i can tell they have all continued to grow throughout the week. I topped yesterday morning and gave the plant their first nutrient feeding last night. I used the general hydroponics flora line along with botanicare cal mag. I fed nutes at a reduced strength than advised on the bottle to start. My tap water is 50ppm and after mixing nutrients and ph'ing the water i came in at 350ppm and 6.2ph. I have maintained a good water schedule and kept water ph between 6.2-6.4 throughout.
I am really hoping this is just a simple deficiency that will be cured with nutrients (fingers crossed), but i am a noob and this is my first grow so obviously i am stressing it hard.
Anyone have any idea what may be going on and what i could potentially do to correct this? Really dont wanna lose any of my girls!!
 

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Coloradoclear

Well-Known Member
My first thought was your light is too low and you may be over watering just a bit. Raise your light up to 16" above the canopy.
 
The light looks too low.
really? when i measure temps with infrared laser they usually read about 79. its an air cooled hood and i have active intake fan bringing in cooler air into the tent. Also stands up to the hand test as well, isnt hot at all on the back of my hand. I thought the goal was always to get the light as close as possible without being too hot
 
My first thought was your light is too low and you may be over watering just a bit. Raise your light up to 16" above the canopy.
interesting, thanks. I always thought the goal was just to get the light as close as possible as long as temp was still in range. I just watered last night but every water up to now has only been when the soil is just about bone dry
 

Coloradoclear

Well-Known Member
When I first used my 315CMH I experienced light stress . . . Plants were not ready for increased light even with cooler temps.
 

StareCase

Well-Known Member
interesting, thanks. I always thought the goal was just to get the light as close as possible as long as temp was still in range ...
Nope. You can give them light stress with LED's and HID's at 8" above. With Colorado on this one. 16" or even 18" above the canopy for that 1000 W HID. And dimming to 50% is akin to hitching a plow to a race horse. At 18", you can start to turn the intensity back up to full and bathe those plants in light.
 

JohnDee

Well-Known Member
Mantis,
Many plants have been grown in FFOF so not the problem. Your room seems to be dialed in far as RH and temp. Raising the lght is about all you have left. The goal is raising a healthy plant...and apparently they don't like the light that close.
JD

PS Use paragraphs in your posts...more people will read them.
 
Nope. You can give them light stress with LED's and HID's at 8" above. With Colorado on this one. 16" or even 18" above the canopy for that 1000 W HID. And dimming to 50% is akin to hitching a plow to a race horse. At 18", you can start to turn the intensity back up to full and bathe those plants in light.
interesting. i thought as long as heat was okay you get the light down as close as possible. I will try to pull it up some and then even click it to 750w. Im honestly not sure if i will be able to run it full power. It gets really hot at 750 like 85 degrees. thanks tho, do you think this may be what is contributing to the discoloration?
 
Mantis,
Many plants have been grown in FFOF so not the problem. Your room seems to be dialed in far as RH and temp. Raising the lght is about all you have left. The goal is raising a healthy plant...and apparently they don't like the light that close.
JD

PS Use paragraphs in your posts...more people will read them.
thanks, gonna give it a shot. my mind went right to some sort of nutrient deficiency, but will give the light raise a shot. hoping for the best
 

JohnDee

Well-Known Member
thanks, gonna give it a shot. my mind went right to some sort of nutrient deficiency, but will give the light raise a shot. hoping for the best
You mentioned bumping your light to 75%...that won't accomplish what you want. Just move the light and leave intensity alone

It does not look like a deficiency at all. How's your air movement and fresh air exchange?
JD
 
You mentioned bumping your light to 75%...that won't accomplish what you want. Just move the light and leave intensity alone

It does not look like a deficiency at all. How's your air movement and fresh air exchange?
JD
Cool, just raised to 16 inches and kept it at 50. Thanks!
My air movement and fresh air exchange it great. I have active air intake with 390cfm bringing air in from a room right next to the area my grow tent is in. I have carbon filter> Duct> hood>duct >440cfm fan>exhaust duct through drywall into another closet area next to where tent is. I have 2 oscillating tower fans in opposite corners and 2 clip on 6 inch fans in opposite corners
 
Hi Jypsy,
People seem to do well with ph 6.4 ph in FFOF so not sure that's an issue.

@mantist0b0ggan just checking if you are secure in your ph meter accuracy. Not super critical in soil...but could be significant if way off...
JD
Def accurate. I was paranoid about the meter drifiting over time so I bought a bulk pack of buffer testing packs so I could check/cal basically every time I water (until I’m watering on a more consistent basis
 

hotrodharley

Well-Known Member
really? when i measure temps with infrared laser they usually read about 79. its an air cooled hood and i have active intake fan bringing in cooler air into the tent. Also stands up to the hand test as well, isnt hot at all on the back of my hand. I thought the goal was always to get the light as close as possible without being too hot
I’m running the same setup. Raise your light.
 
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