Now, IMHO, a 400 is far from a good choice as at best you're looking at 50K lumens, whereas a 600 outputs 90K lumens, which is closer to the ideal spectrum our girls thrive on.
I think you are mistaken here Pet, as an increase in lumens doesn't change the spectral output of the bulb. A HPS from Hortilux (regardless of wattage) emits the same spectrum as the next, the only difference is how much light it puts out in that spectrum. So perhaps you meant "the ideal intensity", but even then you're going to have a very hard time coming up with any data to support your claim. Plenty of people do amazing things with 250W and 400W HPS lights. Take VerdantGreen for example...
Maybe a 205 is not sufficient to compare to a top-of-the-line 600, but whatever wattage LED that is, is the LED v HID/HPS test I want to see.
It's rated to compare to a 400W HID, although for some our 205W could likely replace their 600W HID. Either way, if there is a test you want to see (if you feel this one isn't good enough), then DO IT! Don't just sit around and complain waiting for someone else to take up the cause. It's not like you weren't talking with me about getting LED's in the past, but because I wouldn't go as cheap as your eBay UFO you went elsewhere... It's easy to see via our side by side grow comparisons, that when purchasing a LED you get what you pay for, or we wouldn't have smashed Haight Solid State, beaten ProSource, or made HIDHut look underdeveloped... So please stop the speculation unless you're going to "put your money where your mouth is" and show us the grow you want to see with the lights you want to test.