hps is the wrong color light to veg with,I use just for flr thats it get mh and my 400 watt hps is only 6in from canopy but i'm in flower,and the light 2.5 ft is to far away no more than 12in lumens are measured 12in from top of canopy 50,000 lumens at 12in is 100,000 at 6in and 25,000 at 18in...