Viking Northern Lights white discolor

[cybergasm]

Hi! First time grower here.

Setup:
4 x Cob 50w (2x full spectrum, 1 red, 1 blue)
1x cob 30w white
Closet grow
No nutrients added yet.
Age: middle of week 3.

Since week 2 my plants have had the edges of the leafs pointing upwards.
I have had temperatures of around 30 celcius so I tought it was heat stress.

But now another symptom is showing.


This one showed up during the night.


This one has been evolving the last week, started furthest out on the leaf and moved inwards.

The rest of the plant is looking ok





Any clue?
I used good quality (I think) pre fertilized soil with approx 20% perlite in 10L pots.

 

[namvet25]

Looks like something dripped on it but I wouldn't worry about it,plant looks good.

 

[AutoWonders]

The last pic, how close is the cob?

 

[rick-j]

Good question---

 

[cybergasm]

The last pic, how close is the cob?

I started at around 50cm, moved it up to 60cm.

 

[karlkutta]

We need more specifics, what time was it when you switched the lights on? I will need it down to the seconds.

 

[Waira]

-- edge burn, might be from the rich soil, but nothing bad there, and nothing to do about it anyway,... the other odd streak looks like a common color break we see in seedlings pretty often, nothing to there either,... what soil is this exactly?..... BTW, pics in normal light work best, colored LED is lousy for this....