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.
The life expectancy of the bulb in an LED flashlight ranges from 50,000 to 100,000 hours. Also, because LED lights are energy efficient, consumers will find that each fully charged set of batteries will last more than twice as long as when powering flashlights with incandescent bulbs.ome LED lights are rated as having a life span of 100,000 hours while others are rated at 50,000 hours. It depends largely on the product and manufacturer. With this said, LED lights in general, last a lot longer than any of the other lighting sources that are available on the market today.