I'll take a crack at these questions. Don't take it as the gospel.
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Originally Posted by Matt_C -Question 1-
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"You also have to keep in mind that the Hella's use a H9 bulb, so you either have to find a rebased HID bulb to fit it or else mod the Hella to accept the D2S bulb."
--When I went to the Hella website you posted I believe they have some that already have the D2S bulb. HL68139 is a low-beam HID Xenon lamp with a D2S capsule (capsule = bulb right?), with ballast and adjusters. Am I missing something with this or did you not know it existed. It appears to be the full HID setup. |
I want to say that the D2S Hella 90mm is a new (well to me at least) addition to the page, but I could be mistaken. I don't remember it from when I was reasearching this stuff a year ago.
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-Question 2-
...If I get the regular Hella halogens (HL68137), which come with the H9 bulb, if I want to switch to HID, I will need to replace the entire lamp (capsule, bulb, projector, everything) right?
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Did you check out these links:
*Non Sponsor Links
You should be retaining the projector, and replacing the H9 bulb with the D2S capsule which will require some modification.
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-Question 3-
I compared the dimensions of the two (HL68137 & HL68139), and they have a different depth and capsule. I'm fairly confident that the capsule is the bulb that makes this so much more expensive with the D2S HL68139... but is it capsule that makes the depth difference?
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The D2S one has to be bought with the D2S capsules and ballasts. The H9 housing option is good if you want different ones or have the ballasts and capsules already.
"The dual light source (H9/D2S) labeling on the front glass made several of us wondering a long time if Hella actually used the excact same optical parts, and just replaced back plate so that it accepts the 2mm shorter D2S bulb. But a closer inspection have showed that the optical surfaces of the projector are different. The variance is not easily seen by a naked eye.
The H9 unit has a slight cutout of where a D2S wire should go through reflector, just like OEM HID projectors have. The 90mm unit, in general, is designed for a high output light source (e.g., the H9 bulb). The beam pattern is reportedly DOT-compliant ("harmonized beam") with the H9 bulb at 1870 lm (at 12.8V) - in terms of light output at the various test points decreed by existing US regulations. Actual bulb lumen output on the highway at say, 14.0V would be 136% of 1870 lm, or 2543 lm. A D2S capsule, with 3200 lm output, only produces 26% more lm than the H9, at highway voltage, so optics would not be oversaturated, which can typically happen when original light source is much weaker than an HID bulb."
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If so, this leads me to -Question 4-
Couldn't I just get the halogen lamp (HL68137) and the D2S replacement capsule (HL78400) and save over $350 ?
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Ballasts?
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HL68137 Halogen low-beam lamp $59
HL78400 D2S replacement $102
vs.
HL68139 HID low-beam D2S lamp $538
See replacement capsules at Non Sponsor Link
If it appears so, I am led to -Question 5-
If the D2S replacement capsule is rated at 35W, and the halogen lamp runs at 65W with the H9... do I have a problem?
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I don't follow the question, but typically the wattage of HIDs is lower than a halogen.