Yellowish Spots?

I posted this on my grow log, but figured I might get more help here.
Not sure what these spots are, I'm hoping for some help on a diagnosis. Anyone have a clue?
Troubleshooter...
E-Indoor
E-Soil
E-I'm using a soil mix 2 parts Earthgro Organic Humus and Manure .05-.05.-05 1 part Promix ultra organic sea based compost with AVEC, and 1 part Perlite.
SCLR - 6.6
E- Tap
E - SOURCE PH 6.7
E-Flower 37 Days
E-Fox Farms Tiger Bloom
E-1 tsp per gallon every 3 days.
E-400w HPS about 6 inches away
E-I run the lights at night. Temps are between 70 and 80 degrees.
E-50-63 % RH
E-Lighting schedule - 12h on 12h off
E-Type of ventilation your growbox has - 100 CFM inline can fan for exhaust, Passive intake.

Looks like it's been like that for a while, but when did it start?
Do all the leaves look like that?
Is there anything crawling on the underside of the leaves? (might need a magnifying glass to see 'em)

It was in fact a mite infestation. I tried spraying them down yesterday but that didn't even phase them, there's just to many. So I went and bought a NO BUG strip. I'm going leave it in the room for a day. I'm only 3 weeks from being done but it should knock back the mites a bit, and I won't be vaporizing it for at least 4 weeks that should give the poison enough time to dissipate to a safe level. At least I hope.

I'd follow the recommendations of the spray, and raise lights till dry. Then just before lights out, rinse the stuff off with ph'd water. Repeat if and when it says to.

Keep the pot litter-free, allow soil to dry between waterings, and I'd keep the no pest strip till harvest.

The damaged leaves won't repair themselves, but should still photosynthesize. If you've knocked the mites down, the new growth should be fine.