Originally Posted by Scottina06
a bulb is not a bulb. There is the glass and other componets which are cheaply made in cheap brands. The glass is lower quaality and the length of the glass does not meet standards. All of those make a huge difference.
I should of elaborated on what I meant. Of coarse the quality is not always the same. I was saying that assuming that similar bulbs were installed. A bulb emits light outwards from all sides, and I was under the understanding that it is the reflectors and lens housing that directs the light forward to the road.
I also was not aware different manufacturers made bulbs different lengths. I thought manufacturers made, say a 9006 hid bulb, the same length as others, unless its clearly marked as not a "stock" size. Like the hir bulbs are clearly marketed as being much wider than a stock halogen. I would think any brand new hid bulb installed in the fog light housing would have the same "aiming" EXCEPT the light output intensity would differ between manufacturers due to the quality of the components.
For example I have accent lights mounted under my kitchen cabinets. I had a bulb go out and got the correct G8 halogen replacement. The replacement bulb is noticably brighter and whiter in color, though it disperses the light down onto the counter in the same pattern due to the light housings reflectors. Those dam bulbs cost 7 bucks a piece, for just a tiny bulb. Sorry for my ranting on prices.