What would cause spotting on leaves like this?

I have read thru a lot of information regarding plant health and looked at quite a few photos and can't find anything that is 100% similar to this. Ph is running 6.0-6.5 but should be back under control after today(5.. I am using AN on the Lucas formula at 1/2 strength. Plants are 2 weeks old since sprouting under a 600w MH light. Initially I thought that the humidifier was causing water to build up on the fan and these droplets were getting on the leaves but I have since created a new order in my tent and I am still having issues.

http://emob1275.photobucket.com/alb...00000579028F66C0_zpsa24dd113.jpg?t=1356797537
http://emob1275.photobucket.com/alb...000001DC3EF19E1D_zps6c31921d.jpg?t=1356547192
http://emob1275.photobucket.com/alb...0000057B8F01FED9_zps4967513b.jpg?t=1356797993
Any help is much appreciated
Thanks
CamberSoup

I looks to me like you may have had the light a little too close at some point and it caused some minor burns on your leaves. I notice that your newer leaves look fine... So I'm guessing maybe you had the plant closer to the light then moved it further away as it got taller.

As long as you keep it where it is now you should be fine, your plants look healthy otherwise.