Heat/light burn or deficienty?

Hey
Here is a pic of a leaf with brown spots between te leaf nerves can someone tell me what it is. Note that other leaves are also canoeing/cupping.

Not enough information, whats your grow look like. Lights? Distance? RH, temp, etc. Whats your water schedule been?

You can try and diagnose it yourself using this page:
http://www.growweedeasy.com/cannabis-symptoms-pictures

250w hps, distance 35 cm but i set to 45 this morning, temp 24°C. Water ph at 6,0 weekly. I already looked op growweedeasy, it looked alot like light or heat burn but than with brown spots witch is why im asking it here to

Got any feed on the leafs when watering ? Looks like something on the leaf to me , like an oil stain lol

could be phosphorous deficiency.

Im leaning twoards a magnesium deffenciey,..
Or phosporus....if i was you id goggle nutrient defenciecies ...find a diagram and compare the 2

Id get more pictures of those dark splotches, both on the leaf you showed and on other areas you see it. I think the people citing nutrient deficiency might be right.

Post a pic of the whole plant.

Yeah agree... Dude more pics. How can we tell with that b.s. pic