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.
TV manufacturers say that most DLP rear-projection television lamps last between 1,000 and 2,000 hours. However, these burn-out times vary and can range quite a bit. Some lamps last only 500 hours, while others can last 8,000 hours or more. Much of a lampâs life span is based on its usage. On average, most lamps are replaced every one to two years. Lamp replacement costs vary widely and depend on the lamp and its manufacturer. A quick Internet search or phone call to the manufacturer can pinpoint how much a particular projection lamp costs.