Leaves curling up.

OK, I was using bad lighting, 4 40w flourcent lights for 12 plants kept at a distance of 4' above the plant. I changed that today and now I am using the recomended 6000 lumins per sq ft. I changed this lighting today at about 4pm. I went out for the evening and came back and some of the leaves are starting to curl/reach up. Is this good. Should i down the light a little or just leave it alone?Attachment 287765Attachment 287764Attachment 287766Attachment 287767Attachment 287768

I would not worry they are just growing to the light, but I like to keep the light as clost as possible so they don't stretch