The JWS rating of "effective" lumens is what you are actually experiencing on the road.
Typically, HID and various bulb suppliers advertise "raw" lumens, which does not translate directly. There are significant losses within the headlight housing and lens.
Just talking about brightness, I can say that these LEDs are blowing away my E30 ellipsoids with HIDs. Okay, one can argue that 20+ year old ellipsoids may not be a fair comparison. But they also blow away my ~2 year old E36 Euro ellipsoids (ZKW) with 4300K HIDs, and our 2004 Jaguar S-Type with brand-new projector headlights (thanks to a light front tap) with HIDs.
Beyond brightness, the beam pattern and dispersion is just as important, if not even more important. I can't explain this properly in writing as it must be seen to be understood... but the difference between a reflectorized housing (such as the OE headlights) and a pure projector (the LEDs) in terms of direct, crisp lighting without dispersion is very impressive.
Here's a very interesting picture from the JWS website comparing the LEDs to sealed beam halogens:

- Rob



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