Help having a little problem

Having a little problem with some of my plants they have rust like spots on the leaves trying to figure out what is causing this...i just recently changed my lighting system idk if that could of did this...this is my first grow too...heres my set up

growlab 120
dwc
600hps
general hydro 3 part,great white,cal-mag for nutrients
plants are one week into flower
temp-74
humidity-40%

Can't see very well since its a thumbnail, but from what i can see it looks like rust spots, or maybe early signs of a burn. Are the spots on the edges too? If theyre burned the leaves will crumble easily, but if its a magnesium deficiency(which i doubt since your using cal/mag) add a pinch of epsom salt to your next water. If it turns into a burn then you should flush her.

Better pictures would help though.

Oh, sorry i left this out but whenever i find a deficiency i usually go to this link.

http://www.420magazine.com/forums/problems-pests-disease-control/81275-cannabis-plant-pest-problem-solver-pictorial.html

Thanks for the reply ... So if it's nute burn it can start off as little spots? Cause some of my lower leaves are crispy like you said but new growth looks ok... How can I make these pics bigger sorry new to this site.

thats how my burn started, just spotting on the center of the leaves, which then spread like wildfire to the rest of the leaves. i flushed with clean water for the next 2 waterings, after abotu a week my leaves were back to being their nice healthy green, i did lose a few mind you, but after the flush she recoverd nicely, that'd be my suggestion. flush them nutes out,

Whats your PPM? and pH? Cant assume its burn without knowing these things, you'll end up flushing your system for no reason and still having the problem.

Either way, flushings a good start to this problem, get that done and you can confront your mistake. ExDex1x1 is right though, check ppm and pH, plus rep.