i dont know anything bout the other light you have so i cant help you there and yeah keep 4 inches away unless you dont think there getting tall enough quick enough
if you dont have a tall space then yes goood but i prefer taller plants raise your lights about 6-7 inches away to get them to stretch... GOOD LUCK BRO....
how far away is your lights the closer they are the bushier they get but if you put them to far away they stretch.... i am using the same exact lights as you and i keep them about 3-4 inches from the top of the plant
I was planning on flowering my plant when it gets about a ft. tall and depending on the sex i will cut cones off it is this a good or bad idea? thnx for the input guys it really helps