yellowing in early veg?

[TYCO118]

i WAS running a 500 way full spectrum l.e.d but since its shitty i turned to my 400w MH.
ph kept at 6.
ppm 900

could it be nitrogen deficiency?

TYCO118 Reviewed by TYCO118 on 10-05-2011. yellowing in early veg? i WAS running a 500 way full spectrum l.e.d but since its shitty i turned to my 400w MH. ph kept at 6. ppm 900 could it be nitrogen deficiency? Rating: 5