Greg:
Did you go to the linked site? Comparison charts & a lot more than I have time to look/read thru now.

Seems like the 5 bar unit is comparable to a 250 watt MH lamp on average lumens. (There chart, not mine yet)

Amazing (from the chart) lumens equal to 400 HPS is 2x10 bars, and uses 12% MORE Wattage.

John