It's somewhere around 120,000 to 130,000 lumens. Regular hps 400wtt is like 50,000 and hortilux is like 55,000. Of course your actual lumens will only be a fraction of that depending on how far it has to travel from the source/bulb.
You will want to keep the light as close as you can to the tops of the plants without frying them for best results.. To position it correctly - put your hand over the tops of the plants between them and the light.. lower the light until the back of your hand feels warm but not uncomfortably hot. That's where your light should hang throughout the growing process. (adjusting as necessary for plant growth)