I actualy got my light from the UK (Im in Denmark)
found it cheap at Basement lightning (great service, had it in 4 day`s)
here is a link to the light I bought:
http://www.basementlighting.com/Merchant2/merchant.mv?page=1/PROD/HRLP
only 55 buck for a 600W poot light, just plug it in, tho it is used but reconditioned, german quality used in green houses, new wiring and a new quality bulb, and a warranty, did really good on my fist grow
but do to high temperatures last summer I had to make a DIY cool hood for it to get my temps down under +30C
(my room is 3x5 and I run a 6 inch ventilation and have a normal ambi temperature on around 22C but last summer I had +28C some days)
with the cool hood on I can keep temps around 24-26C even had to turn on the heat a bit now at winter time, could probably run it all year except summer time with out the cool hood ..
so take that in to consideration as well, need a strong ventilation, and a filter for the smell in flowering, Im now running it on its 9th months with no problem, near the end of my 3 flowering cycles, still works perfect and bulb still put out around the same amount of light