Why all the sudden yellowish sprouts

[Chuckyz2]

What Strain is it? OG Pure

How Many Plants? 9
Is it in Vegetative or Flowering Stage? Just changed to 12/12
If in Vegetative Stage... How Long? 3 weeks
If in Flowering Stage... How Long? 1 day
Indoor or Outdoor? indoor
Soil or Hydro? soil
If Soil... What is in your Mix? Dont know.. Its the bag that is white
with green leafs on it. Already thru the bag away.
If Soil... What Size Pot? 5 gallon
Size (Wattage) of Light? How Many? 1 1000 hps
Is it Air Cooled? it is now but rand 8 hrs no glass too close to plants
Temperature of Room/Cabinet? was 85 to 90, now 75
RH of Room/Cabinet? 40
PH of Medium or Reservoir? dont know Nute water is adjust down slightly to 5.7 Now 5.9
Any Pests? no
How Often are you Watering? was watering everyday. Now when dirt drys almost all the way.
Type and Strength of Fertilizers used? GH Nova 1.5 spoons per gallon. now 1 spoon Tap water with 300ish ppm tds
Size or Square Footage of Room? 10x20

Changed to 12/12 and let run only 8 hrs on the 1000 hps with no glass and no hood fan. Set lamp at 14in. Temps got up to 90 on the canopy. Then shuyt down for 32 hrs to change time schedule. When lights came back on the top of all the plants were noticably yelloish. No spottinf just from deep green to almost yellow. They seem to be coming back very little but are still kind of yellow. Sorry no pic.

 

[OrganicTreees]

we need pics to help diagnose what the issue is

 

[Chuckyz2]

we need pics to help diagnose what the issue is

This was a couple of days ago and I didnt take pics. Sorry.
Can the light being too close or causing too much heat make them yellow?
Or can 32 hours of sleep make them start to yellow?
If one of these is something that can make a plant yellow then
that is what it most likely is.

 

[OrganicTreees]

If the lights are too close, you will likely see burns on the leaves. Since it's been a couple of days it would have set in by now, so feel the leaves on top and see if they are crispy at all.. If so, just back the light off a little bit, or get a fan blowing on it, it will bounce back with new growth.

The only other thing that would make your tops yellow is if your ph is off and your feeding is off.

 

[Fuzzy Duck]

Nitrogen defiencey is a common cause of leafs going yellow.

Depending on your individuals nutrient/feeding regime this may change towards or going into 12/12 for flowering than of veg stage where the NPK ratio is different depending of stage of growth or what phase its in !

 

[OrganicTreees]

N def's are typically the reason for yellowing, but a deficiency would show on the lower leaves first, where a ph imbalance would affect the top growth. Without pics, it's hard to diagnose.