yellow spots on my leaves

wondering if anybody can help me here , i use a 400w hps in a small grow cupboard abot 1.3 metres wide and 90-100 cm wide , i have a fully veg bigbud plant , healthy and normal , im growing soil , but i put it intoo flowring exactlly a week ago today and there is small yellow spotts on some of my leaves , ive checked for bugs and spider mites , ive not been checking my ph levels as i live in scotland and our tap water comes from the ochil hills , dont know about nuitrence , ive not gave it any all throughout the grow , it a very healthy plant but i dont know what could be causeing this defficency , might be the heat , or possiblly the fans i was thinkiing ? help please

Sounds to me that you needs some nutes in that pretty lady........

I second biggz. time for some nutes. and the ever going argument on flowering nutes with nitrogen and flowering nutes without nitrogen.

okay i gave it some nuitrence and i'll see how it goes from there thank guys, ill keep youe poted and put up afew photos in afew days , hopefully they go away , im really worried about it , thank again?

No prob.....That should help her out tremendously......Don't forget to flush every 4 weeks........

i am growing in soil , and thanks