Virgil, you have access to a lot of photometric testing, why don't you give us a run down between a few contenders for maximal beam distance in bith low and high beam, and maximal beam width, for low and high beam, and each lamps intensities at ow and high?
Mostly because I have to do work that pays bills!
Also because the answer keeps changing. Basically every time Audi, Mercedes-Benz, and BMW introduce a new LED headlamp, the benchmark moves (upward). HID performance from LED headlamps was a mile marker passed a long time ago, I think 2011 or so, and it was a car by one of those makers. That is not to say that those are the only car brands with best-headlamp contenders, nor to imply that any headlamp on one of those brands of car is automatically superior. Nor does it mean you have to spend BMW-Audi-MB money to get superior LED headlamps. Pretty much everyone (subjectively and objectively) raves about the LED low beams on the 2014+ Toyota Corolla, for example. I have had difficulty getting details on the objective differences between the earlier version that has LED for low beam only (HB3 halogen high beam) and the later version that has a high/low beam LED projector. It's clear to see that they're different enough not to be lumped together -- the only-lowbeam unit has a more or less straight cut-off line, while the dual-beam unit has a stepped or "Z-beam" type of cutoff, for example -- but it seems like most of the tests I've seen have just reused text and ratings from the earlier version and assumed they applied to the later version. :-(
It's been stated for years and years that Hella's 90mm bixenon is the top dog.
The Hella 90mm BiXenon might or might not have ever been the top dog in general -- probably not, given the packaging constraints required. So far it is the best standard-mount 90mm high/low beam lamp anyone has made, and as of at least a couple of years ago the 7" round lamp based on this 90mm BiXenon Hella projector was the best 7" lamp. But the LED lamps have been improving by leaps and bounds.
How does the halogen version stack up?
The BiHalogen version of the Hella 90mm lamp is decent. Not amazing or outstanding. The BiLED version of the Hella 90mm lamp is not very good.
I've also seen the promotion for Hellas 60mm halogen projectors. How do those compare
They can be given a kick in the pants by replacing the HB3 (9005) bulb they use, both the low beam and the high beam unit, with HIR1 (9011), but they are still inexpensive, basic low-tech, and relatively weak on performance.