If you eventually plan to take all four parts of the exam, you can check all four boxes. After you pass one part of the exam you have 18 months to take and pass the other three parts. See the 18 month requirements below (How do I calculate the 18 months rolling window?).
Though you may not notice, as bulbs age they don't generate as much light as when they were new. That means your headlights may still work after five or six years, but they may not be as bright or illuminate as much of the road as they used to.
LED Lights generate very little heat, which means LED Lights are 90% energy efficient. LED Lights last greater than 60,000 hours. LED lighting last up to ten years or longer! The standard incandescent light bulb last 1,500 hours.