Cheers jimmyspaz! To read about the wonders of HPS is one thing, but to actually see the difference between CFL and HPS is another. The difference is shocking. The light seems to penetrate the foliage so much more. It looks more natural too- the colour of the light, I mean. So you think it's not low pressure then? I wasn't sure. How can you be sure it's HPS jimmy? Is there a way to tell? Thanks mate.