switched from cfl to hps,, water question,

i recently switched to growing under a 400w hps- i had my water schedule down pretty good-
I think now i may be underwatering and not giving enough nutes,, does the plant need more food undera 400w hps compared to 500 watts of cfl..

It seemed like my girls needed water more often when I went with HID and cfl's, rather than just cfl's.. Just let your plants tell you when there ready!

i always kept my plants green green..but i have light green plants now, everything is the same except the light,, all my plants are in 5 gallon pales, i feed one gallon when feeding,, i suppose it would make sense more heat, more light, more food needed