[Rooz]

read my post, it helps a lot

http://www.unitedbimmer.com/forums/thread330.html

If not, well read this:

Ellipsoids: What are they? They are projectors, and OE in Europe. They increase lowbeam range 30%. There are 4 main manufacturers. Bosch and ZKW, which are OEM, Depo, which is aftermarket, and InPro, also aftermarket.

ZKW/Bosch are the best. They also cost the most. They are OEM quality. Virtually no problems.

Depos are second rate. They cost 50% less and occasionally fog. They also don't use as high quality glass on the projector, as the light output is not as good as ZKW. This does not make them bad though. They are still a tremendous improvement.

InPro. Bad Depos with ZKW price tag.

HID: High Intensity discharge. 3200 lumen output compared to halogens which are barely 1000. The kelvin temp. is also higher. OE HIDs fall between 4300K and 5000K. These are white. 6000K is white but slightly purple. As the Kelvins increase, the light becomes more purple. The lumens also decrease. HIDs are expensive for a reason. Do not buy crap. Invest good money in them. Phillips, Osram, Hella. Accept no other.

Angel Eyes/Demon Eyes: LEDs are bad. All others are virtually the same. Few members have them, so whichever looks brighter in the pic you are looking at is the brighter one.

This was a reply made by Umnitza in an other forum:

These are subjective and objective opinions, so take them for exactly what they are. You have your "OOO" <-- order of operations so here goes:

1) US Lights are on par with the original candle powered street lights in the late 1800s...a little hyperbole, but true.

Positives:
Cheap $120 for a pair new and $60 for a used pair.

Negatives:
Can't see
Bad Light dispersion
Incapable of using HIDs properly
Flimsy
Plastic
Fog up.

2) Generic Tawainese Ellipsoids (Depo (3 variants), DJ Auto (ZKW knock off), InPro). DJ Auto is the best of this group of Taiwanese lights.

Positives:
Cheap - $150-450 depending on options.
75-80% of the big boys (ZKW, Hella UK, Bosch)
Can be optioned up like any of the big boys - Plug and Play, HIDs, Stongard, leveling, etc.
Capable of including REAL DDE (DEPO ZKW-like, and DJ Auto ONLY)
For those wanting DDE (DEPO ZKW Like is the best for this because it has a sheild that keeps glare at bay and allows the DDE to shine without disappearing when the low beams are on).

Negatives:
Cheap plastics (All)
Can easily break during disassembly for installation of DDE
Thinner lower quality refractory lenses.
Thinner outer glass (not DJ Auto).
Ugly (certain variants of DEPO that arent' ZKW-like).
Include invisible, low quality angel eyes (DEPO variants and InPro).
Fog up easily (InPro)
Have refractory lenses that can melt (only INPRO)
Lower quality projectors (All)
Lower quality reflectors (All)

3) German Replacements, OEM Quality (ZKW, Bosch, Hella Original, New Hella OptiXXX). The best here is whichever you want to suit your needs.

Positives:
Generally it's been acclaimed that the original Bosch and Hella units in the EU were superior in build quality and projectors. They are hard to find now and more expensive.

All include leveling of some sort - it's preconfigured, but not pre-installed.

All include bulbs (low, high, city), all are H1 (except the latest Hella).

All do a great job of getting the MOST out of your HID setup.

All can be optioned up - PnP, Stongard, Leveling (not from us), and even HID.

All are available and easily installed with DDE Lightning or DDE Lightning Enhanced (hey, if you want no sales, then create one of your own threads )

Only approved headlights located in the ETK (not Hella Opti...the new ones).

Sold primarily by vendors you can trust - BavAuto, TurnerMotorsport, etc.

Hold their value the best (buying a ZKW 2 years ago in our initial group buys for $360 shipped, still lets you sell them for $350 today). No other product holds its value as well provided good care and maintenance.

Negatives:
Cost (generally $350-1400)