Hella's still a greedy corporation that'll do anything to make a buck. And lately they've been letting marketers run the show way more than they should. I mean, look at the entire OptiLux line of crap.
In my opinion, the existing standards-compliant HID low beam headlights are not better than the halogen setups. There are several facts I base this opinion on:
- The higher short-wavelength component of HID lights' output means the light will scatter more in bad weather, causing increased glare levels for both the driver and other traffic.
- The higher short-wavelength component also causes other difficulties like making things a little harder to focus on and making it a little harder on your night vision.
- It's also harder on other drivers' night vision, particularly if you're using such a small headlamp. A small lamp means that a large amount of light is concentrated in a small portion of the visual field.
- The non-continuous spectral output of the HID light source means that HID lights have worse color rendering indices than light bulbs do. Not that the difference in CRI is a really big deal, but it's nice to know you can see colors more clearly.
- The high voltages that drive HID capsules have the potential to be dangerous. Did you know that all OEM HID setups disable themselves permanently when the car is in a wreck? This is done to protect rescue workers from being electrocuted.
- Legal HID low beams often suffer from the problem of having too much light. All headlamp beam regulations place maximum limits on intensity at various places in the beam. It's easy to hit those limits even with a halogen light source. So with HID, the designers have to find places to stash the extra light. Those places are often right up in the foreground, where they make the driver feel more comfortable (and so make the lights easier to sell) but actually damage distance vision.
- HID lights cannot be flashed on and off. That removes one of the relatively few methods a driver has to signal things to other drivers.
- And of course, HID lights are much more expensive than halogen lights, even in terms of lumens per dollar.
Basically, the only way in which HID is actually better than halogen is in energy efficiency; you get roughly 80 to 90 lumens per watt. Halogen light sources give around 20 to 30 lumens per watt.
To me, it seems that a high-output halogen light source is the way to go.
Hey, no attitude intended!
I'm sorry... I just got thrown off by the shouting and by your twice quoting and rebutting Hardy's statement

. No biggie.
And you know, if it were possible to put a really nice pair of headlights on a pre-facelift car for only a few hundred dollars, I might actually consider converting to a pre-facelift front end, if non-North-American corner lights would fit.
"Just reading vrg3's convoluted, information-packed posts made me feel better all over again." -- subyluvr2212