I can't read what the stats are and I haven't seen these lights befor so I couldn't tell you how many you will need. I currently have four clones only a few inches tall and they each have their own light over top of them which works but I add another light to the top or side as soon as leaves start to shadow themselves. That's my rule of thumb. When I see a shadow its time to add another light. I currently have 9 cfls of various watts and such on one 2 month old clone now in flowering. Everyone has their own rule of thumb but I figure if your leaves are shadowed then theyre not getting enough light.