Most likely, you bought a replacement bulb that is lower in wattage than the old/stock headlight. So the light output is lower. If you want your headlight to look brighter, you might want to consider...
In most headlights, the rear of the lamp body can be removed, giving good access to the bulb and bulb holder. If the bulb has broken, the safest way is to remove any remaining glass to prevent cuts...
Headlight adapter will depend on what type of aftermarket headlights you currently have. Many aftermarket headlights come with plug and play adapter. Meaning they will directly bolt onto your stock...
Halo and projector headlight are pretty much the same thing. They function very similarly. However, Halo will give you the look that you seen on BMW headlights. Projector headlights will look the...