Meph S.O.D.K. F21 Leaf discoloration and curling

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Problem: Some bottom leaves turned yellow and leaves throughout plant are getting rusty spots on edges and tips of leaves and edges are curling up.

Medium/grow method: Fox farm Happy frog in 5gal smart pot w added perlite

Feed: and supplements used: Advanced nutrients bloom a&b @ 2ml/liter, calmag @ 1ml/liter, carboload @ 1ml/l, overdrive 1ml/l

water source: Tap water 8ph before nutrients, 6ph after.

Strain/age: Mephisto Sour Orange Diesel Kush at Day 50 from sprout, day 21 of flower.

light used: 150w Quantum Board @110w and 15inches

Climate: H:78F L:75F temp, H:50% L:40% RH

Additional info: Todays watering was plain water with compost tea at ph 6.8 with runoff at 7. The discoloration and curling has gotten quite a bit worse over the last 5 days, I have raised the light twice and tried dimming it thinking it was light burn but it hasn't improved.
 

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Have you checked your soils ph? Plus it seems you are feeding it lots that soil has load of nutrients in it no?
I cannot run my QB that close without damage as yours from light stress. I run mine at basically 120 watts seed to chop at 20 to 24 inches. I want to lean light stress.
 
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