These lights are no joke. Comparing plants from the same mother but are under a different light, you can clearly tell the difference in trichome production and size. Quite amazing.
I'll take some pictures tonight of the girls under the PS cob and post them here. The entire point of the PS cob is that it is much smaller in size, lighter in weight, and has very similar light coverage as the goliath. With the goliath you have to add additional support if you are using a tent. The cobs spread the light out very evenly and efficiently.