What LED to get? how close can you have LED?

I have not seen par test in this exact model, but I have seen a par test done on their 200w model (actual 96w) and it falls way below a lot of other lights at much lower costs. I would look into getting a quantum board kit, they are stupidly easy to wire up, if you can plug in a cable box to a tv you can wire the led rig. For a 1.2x1.2m I would look into a minimum of a true 480w setup, ideally 640w. You can find some great deals directly from china on Alibaba, search for "lm301b or lm301h" and then look for a 480 to 640w set up. You can also find them on Amazon for s little more $$$ vs Alibaba if you want to have Amazon as a level of protection from getting ripped off. I think the msr of the light you listed was £550, you can put together a killer quantum board setup for that price. I personally use qb288 boards on individual heatsinks so I can move them around as needed. I have one driver mounted outside the tent to help keep temps down as well. If you end up with a 480w to 640w setup, at full power, you will need 24" to 36" of space for flower and all the way up or dimmed for veg. These boards are intense.