Experienced Uc-ers Needed

[kennyflowers]

Any ideas what this is?
Specs=
DE lights
CS nutes
Temps 75
No co2
Humidity 55/65
Closest Plants 3' away from bulbs
PH 5.4-6.2 (5.8-6.1)average
Day 29 flower
Ppms 400-500 .5 scale
Water temps 65/66
Roots are white
3mls per gal uc roots
Mycostop
Calimagic 100-125 ppm w/ro water
Yellow and brown spots closest to lights.
Fertburn?
Light stress?
Cal deficiency?

 

[kennyflowers]

Trying to post a pic. Does it clear picture info automatically when posted?