HID vs LED vs Halogen bulb. best bulb for new cars in Pakistan? which is better for the older cars?

We take a look at the best light source for car headlights Pakistan, Halogen is the oldest, cheapest but worst. LEDs can be the brightest and most efficient but are retrofitting LEDs good for cars with the side mounted diodes? HID seems to be the middle ground if the car meets the prerequisites of projector lamps etc. Dive in to see the difference in all of these.