Large fans are dieing, Yellow

[nvhunter]

So im 3 weeks into flower roughly. The lower 1/3 of the plants fan leaves are dieing off slowly. I have read that this is common but its still disturbing since this is my first grow. So I decided to add a pic just to get assured. Is this normal?

 

[cannasensei]

They look all yellow under hid. Gotta take em out of the bright light for an accurate diagnosis. Sounds like nitrogen deficiency. Got Amy bloodmeal layin around?