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 HID FAQ 
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This is a copy from;
http://twinturbo.net/net/viewmsg.aspx?f ... dtSearch=3
This should dispell any misconceptions, missinterpretations or falsehoods about HID lighting.




There's alot of information out there, and alot of lighting vendors attempt to prey on the fact that few people put in the research that it takes to make intelligent decisions about purchasing HID lighting.
This is a FAQ I found many months ago while researching what I wanted to do as far as HID kit's were concerned. Of special interest should be the section labled MISCONCEPTIONS, which I have pasted into this message (sans photo comparisons)
http://www.intellexual.net/hid.html

MISCONCEPTIONS

There are many companies and private merchants out there that will advertise 7000K, 8000K, and even 12000K HID kits. Most of these vendors lurk around on ebay, online car forums, websites, and ricer accessory shops. 100% of the people that buy these kits do so because they are uninformed, uneducated, or misguided in the field of lighting, and will buy these junk kits thinking three things: that these bulbs are brighter, that these bulbs should cost more money, and/or that they will perform better. All three statements are completely false. Perhaps this misconception and frenzy for purple lights originates from BMW and Audi's infamous Hella projector HIDs.

So allow me to explain the real truth of the matter... Philips is the number one manufacturer of HID bulbs. The Philips OEM D2S bulb is rated at 4100K at 12.8 volts and produces 3200 lumens of light. The Philips Ultinon D2S is 5800K at 12.8 volts and produces 2400 lumens of light. As you can see, with all other factors remaining constant, the brightness of an HID bulb declines the higher up the color index you go. Vision, a Korean bulb manufacturer, makes an 8000K bulb, which they used to advertise on Acura-Forums as 2000 lumens bright. This is barely a marked improvement over halogens, and will produce more glare and eye fatigue than it is beneficial. 4100K has been proven through tireless independent research by the Germans, Japanese, and Americans to be the most functional, truest white and thus the brightest possible color temperature (ceteris paribus).

Every car manufacturer in the world (including BMW and Audi) uses none other than a standard 4100K gas-discharge bulb. No exceptions. The reason being is that 4100K is daylight white in color and produces the same color visible light as direct sunlight. This is least fatiguing functional color on the eyes and produces the most comfortable contrast on the road.

So the million dollar question is now: Why do BMW & Audi lights appear blue when they use a white bulb?

Well, this coloration is the result of the light projectors; the lenses: it's transparency, it's curvature, the tiny grooves etched into it; the projector assembly, the shield, and the reflector bowl. All these components work together to produce a signature of light unique to that particular optic's design. On the Audi and BMW projectors, the lens curvature at the edge bends the white light producing a "prism effect". White light is broken down to it's fundemental colors. Since blue lights is high energy, it is absorbed last and thus travels farther. So with this prism effect, you'll notice that BMW HIDs are only purple and blue from the sides, the top, and the bottom edges, but are always daylight white on the road and in the beam pattern. This phenomenon can be demonstrated when you watch an oncoming BMW hit a pot hole or speed bump in the road and the car's nose pitches up and down. The headlights will flicker and "throw colors off", but returns to a solid white beam pattern directly on the road.

Trying to emulate this color-flickering effect with a solid-state blue or purple bulb is only detrimental to lighting performance, it doesn't fool anyone, but most importantly it endangers other motorists around you. Blue light has what we call a very high diffuse density, which causes it to radiate outwards as opposed to forwards. What results is a wide glow of light outside the beam pattern that is blinding to motorists you share the road with. A blue HID bulb will produce color bleed around the headlight, around the objects it lights up, outside of the beam pattern, and around the cut off line. This is effect is known as "glare", and these illegal and improperly installed HID kits are the reason why HIDs get a bad wrap. As common evidence of glare, observe a traffic light at night in a dimly lit area. There is red light and green light. Red is opposite blue and green is next to blue, thus we can substitute green for blue. If you observe the aura, or glow, of light around a red light and compare it to that of a green light, you'll notice that the green light produces much more glare than red. Blue is even worse. Purple, the worst.

Here are some examples...

Above you are looking at two 8000K HID low beam and fog light kits installed on a GS300 (gs300). One of the foglights retains the orignal halogen bulb for comparison purposes.

What I'm trying to illustrate here is the glow of blue light (or glare) that radiates off 8000K bulbs. This glow breaks out of the beam pattern and blinds oncoming motorists. Also note how small the actual brightness gain is when you go from factory halogen to 8000K HID. Is it even worth your while?

Blue light also shifts the color hue of everything on the road to blue scale, which fatigues your eyes more than a standard halogen bulb, and it's brightness isn't that much of a marked improvement over a xenon-filled halogen bulb. As evidence of this blue eye fatigue, anyone in the Armed Forces, or anyone who is an astonomer/stargazer, knows to read maps and charts at night using a red light. This is because red light (on the opposite end of the visible light spectrum from blue) doesn't burn into your eyes and affect your night vision like blue light does. As an experiment, momentarily shine a red LED in one of your eyes and a blue LED in the other. Close both eyes and notice how the blue LED burns into your cornea a lot more than the red does. This is because blue light is higher energy and thus causes more strain and wear on the light receptors in your eyes than red light. Kind of like blasting your car stereo at 100db for half an hour straight would fatigue your ears.

Color in light is caused by the absence of other primary colors; therefore a blue bulb is a bulb that lacks red and green hues. This also means that a white light is the presence of all primary colors of light. White light is more intense than any single color by itself. Why do you think those novelty black lights are so dim compared to regular incandescent bulbs? In fact a 5800K bulb is 800 lumens dimmer than a 4100K bulb made by the same manufacturer. It is also useful to know that 6000K is the highest marketed color temperature produced by the top lighting manufacturers in the world. Most bulbs marketed at 6000K are actually producing color slightly lower than 6000K. The reason 6000K is the plateau isn't because they physically can't make an 8000K bulb. It is because anything above 6000K is not effective as a lighting instrument. So don't believe those ebay auctions boasting "Revolutionary 12000K HID bulbs from Germany". That is just BS marketing gimmick at work.

One trick these HID con artists use is to market their HID kit as "German Philips 8000K HID kit". When I inspect these advertisements closely, what they are in fact doing is selling you a real Philips ballast, but some cheesy, generic, unlabelled 8000K HID bulb. But what it sounds like is that you're getting genuine Philips 8000K bulbs. Not the case. Many of these 8000K bulbs aren't really even producing 8000K light internally. I've seen 5000K, 7000K, and 8000K HID bulbs with blue films coated over the bulb, which act to filter out all light produced except blue and purple. This in effect dims your light output substantially.

All of the bulb manufacturers that make bulbs over 6000K are smaller, relatively nameless start-ups. This explains why they are producing a poor selection of bulbs. Philips and Osram control the oligopoly on the HID bulb market, and the only way for these small guys to stay afloat is to appeal to the niche market of rice-boys who want their cars to look unique in any and all ways possible regardless of tact or taste. So they manage to successfully peddle these 8000K bulbs to a smaller group of uninformed buyers knowing that they'll have no chance trying to head-off Philips or Osram in the OEM market.




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December 04 2006, 10:23 PM
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Moved to the lighting faq..

Thanks John.

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December 05 2006, 2:31 PM
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No problem Barry, thanks for moving it.

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December 06 2006, 11:43 PM
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This will also give a better understanding about HID Retrofits;
http://www.danielsternlighting.com/tech ... sions.html

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December 21 2006, 12:35 PM
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http://www.hella.com/produktion/HellaRe ... _Xenon.mpg

http://www.hella.com/produktion/HellaRe ... _Xenon.mpg

http://www.hella.com/produktion/HellaRe ... _Light.mpg

http://www.hella.com/produktion/HellaRe ... ghting.mpg

http://www.hella.com/produktion/HellaRe ... ARILIS.mpg

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December 23 2006, 10:22 PM
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