Projector PreparationThe housing you just bought for a mere sixty dollars is actually very similar to the Hella projector that comes with their D2S kit that costs upwards of seven hundred dollars. If you inspect the bottom side of the glass lenses you will find a marking: H9/D2S. You have the H9 low beam. After opening the black aluminum backing you will also see a pit in an otherwise perfectly round circle where the bulb goes in. Coincidence? I dont think so, that pit is actually there for the electrode lead going to the front of the HID capsule. Although Hella has told me twice already that they are not the same products the pit, which is a space for the ceramic-coated electrode lead, as well as the marking on the projector tell me that they are the same part. And when you see the beam pattern there will be no doubt in your mind
Figure: Here are the two give-aways that tell me this doubles as a D2S projector.
Now the only thing to do is to modify the back mounting plate for the bulb to place the capsule in the same spot as the filament in order to maximize light output. When placing the D2S bulb in the H9 mounting location you will find it is about 5-7mm short of where it should be.
Figure: Placing the bulbs side by side out of the housing you will see if the bulbs were mounted with the stock mounting plate the D2S bulb does not go deep enough.
Take a look at the bulb and test fit it into the place where the H9 should go. You will see around this is a raised flange that guides the bulb into the proper orientation. Coincidentally both the H9 and the D2S have the same diameter. The next thing you must do then is grind out all that material inside the flange except for a little tab at the top of the projector back plate to align the D2S capsule. Take a large washer you purchased from the hardware store and grind it down to fit inside the back plate. Take some small machine screws and drill through both the washer and the back plate and tightly bolt them together. If you choose to glue these pieces together make sure the bond is tight by hitting it with a hammer with moderate pressure. Also ensure to test fit the bulb to make sure the electrode lead does not touch the washer and grind down if necessary. Why have you done all this just now? Your light is mounted properly and your capsule is now deeper in the projector where it needs to be.
Figure: Here is the back plate after being bored out. Note that at the top of the plate a tab that remains to align the bulb correctly
Figure: Here are all the parts used before the washer was drilled and inserted
Figure: This is what your final product should look like. Depending on the size of the washer purchased more work may be involved in getting the flange fitted in the back plate. I found a washer with a 2 OD and 3/4 ID fit perfectly.