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.
Average amount of time an incandescent light bulb will last: 750 hours: Total amount of time modern light bulbs can last: 10,000 hours: Average amount of electric bill that is from lighting: 25 %: Total amount of years the worldâs oldest light bulb has been glowing: 108 years: Percent of electricity that converts into light: 10 %: Total amount electricity that is wasted on light bulbs in lost heat $4.80: 90 %