As far as lumens go I believe it is in the range of 21W HID (correct me if I'm wrong). Isn't a WA 10W HID 450 lumens?
From what I've seen, HIDs are more efficient at higher power, LEDs are the opposite. A 10W HID is commonly rated at about 500 lumen. A 21W HID is about 1,500 lumen. A 35w HID is about 3,000 lumen. Doubling the power more than doubles the output.