Is this light burn or a nutrients isue

[Floodster31]

 

[Floodster31]

Its in soil fed bio bizz at 6.5 ph lux is 22000

 

[totamus]

It looks like too much light to me. If your lower leaves are all fine and only the top leaves have that veining and yellow tips, then I would reduce your light levels. I try to keep mine around 750 par, if I go much higher I get the same thing...

 

[Floodster31]

OK I will turn them down and see if that helps the lower leafs look OK

 

[Floodster31]

The thing that got me thinking it was not light burn is the fact the out side branches that are towards the edge of the lights foot print are the same

 

[totamus]

I chased it down for quite some time. I thought I had nute issues or PH issues. Turns out I DID have PH issues, but the low soil ph wasnt the cause, it only made the plant more susceptible to light damage. I was purposely trying to stay at the high end of the acceptable light range and shot myself in the foot. Too much light is hard to diagnose. The symptoms I look for are: 1) yellow tips on top leaves, 2)Veining on top leaves, 3) a lighter color on the top of the plant (bleaching...) and 4) other variables in control (ie PH, Nute level, moisture content, temp)

 

[Floodster31]

I have ordered a blue lab ph tester as I have a cheap one that I have to calabrte often maybe this is the problem

 

[growsince79]

It looks like too much light to me. If your lower leaves are all fine and only the top leaves have that veining and yellow tips, then I would reduce your light levels. I try to keep mine around 750 par, if I go much higher I get the same thing...

22000lux is very little light.

 

[growsince79]

Plants look hungry.

 

[Floodster31]

Maybe. I will up ppm on next feed see how that goes thanks the only thing I don't understand is normally if under fed the lower leaves would yellow but mine are a normal colour not lime green like the top

 

[growsince79]

The thing that got me thinking it was not light burn is the fact the out side branches that are towards the edge of the lights foot print are the same

If the roots are bad, or nutes locked out for whatever reason the leaves can't handle as much light. So even though 22000lux is very little for a healthy plant it could be too much for yours.

 

[Floodster31]

Thanks for the help everyone I'm going to flush then start nutes again

 

[Floodster31]

A week later I'm now thinking this could be over watering it's getting worse have only watered 1 time this week