I suppose I may have introduced some bias by asking Dan about Koito JIS. Between housings, reflectors and bulbs the cost is nearly $400 USD.
Really? Yikes, that's way more than I paid not too long ago. What are they getting for the housings these days?
I explored the links, you seem to like Hellas a lot. Can you elaborate as to why that is?
Of the dozen-or-so well established OE lighting suppliers in the world, Hella's is by far the biggest aftermarket product line. They do have some inexpensive offerings intended mainly to be just a little bit better and take away some sales from the off-brand cheap junk. But most of the Hella auxiliary lighting line is of very good design, build, and quality compared to a large proportion of what's out there overall. The reason is sort of obvious: Hella's enormous OE supply activity means they have, in-house, everything -- at top-of-class level -- needed to design, engineer, test, tool, build, quality-control, and distribute pretty much whatever lamp they dream up...with any technology...at very low cost compared to companies that have to outsource and contract for any (or all) of those steps. And they tend to run a "tight ship" with regard to standing behind their stuff and actually providing what they list in their catalogs (this is where Valeo/Cibie fell down pretty much constantly over the years in North America). That's not to say that any-every Hella lamp is a sure bet; there are some clunkers and lacklusters in the line.
The halogen options seem comparable to stock headlights, at 55 watts.
The watt is not a measure of light output, number one. Number two, on the list of automotive road-illumination bulb types there are about twenty different 12-volt, 55-watt halogen types producing from about 900 to 1820 lumens. These are different, almost all non-interchangeable types, the point is that there is no such thing as "the" output of a 55w bulb.
What's more, it doesn't actually matter whether you have an 1820-lumen 55-watt bulb or a 900-lumen 55-watt bulb. That's not what you see as a driver. You see how much light the lamp puts out, and in what kind of a distribution pattern. It is perfectly possible for a lamp with the 900-lumen bulb to be more efficient and better engineered so it puts more light in more usable places for you than a lamp with the 1820-lumen bulb.