First plant ever - Yellow spots at tip of leaves, please help

Hi all. This is my first grow ever, and I'm growing nirvana's northern lights auto feminised. Got 3 100w LED bulbs on her(the kind of LED bulb youd replace a cfl with in your house, not the cool red/blue/purple one).
Got her growing in a 3 gallon pot with a soil mixture thats 1 part peat moss, 1 part FF OF and 1 part cowmanure/compost from lowes.

She popped on the 7th, so shes about 2 weeks old. But today i checked on her and shes got small yellow spots on the very tip of her first set of true leaves.
I'm thinking nitrogen deficiency?? Any help would be greatly appreciated.
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