I've ordered the 300W light from M-Land. It should arrive in the next week or so. I plan to put it into operation as soon as possible, I'm not sure if I want to do a side-by-side comparison, but I should be able to tell on a more general nature how the light is doing.

Based on what I have read, the 300W is equivalent to a 1000 -1200W LED, which is supposed to be equivalent to a MegaWatt HID imp:

It has half the energy consumption of my 600W HPS but should have a much higher level of usable light for photosynthesis. Watt for watt, the inductance light looks very promising.

I'll keep everyone updated,
bigdutchman