Can you just replace halogen bulbs with LED in a car?
All vehicles fitted with halogen headlight bulbs from the factory are suitable for LED conversion. The main advantage is a massive increase in road illumination and therefore improved safety when driving at night. via
Do you need a new transformer for LED lights?
They will have a transformer either in the ceiling or light fitting. Some LED bulbs, like the Philips Master LED range, have in-built circuitry that can deal with most (but not all) transformers, so you don't have to change them. In other cases, you need to replace the transformer with an LED driver. via
Is HID the same as LED?
The two different technologies are entirely different methods of producing light. HID bulbs contain inert gas within the glass casing while LEDs are a solid state technology. HIDs emit a lot of heat and a large portion of their emissions fall in both the IR and UV spectrum. via