Can anyone tell me what these spots are..everything was going well untill I put the dimmer up on my light to 700 par on the canopy then the leaves went like this and more and more cars turning everyday...can anyone tell me what might be wrong? Thanks

What is the pH and PPM of the soil runoff?
Keep an eye on your v.p.d. Look that up if your not sure what it is. If your humidity and temps are not in line your v.p.d could be off and if your plant is transpiring more than ideal amounts you could be getting toxic nutrient buildup. Just an idea. Good Growing.