Which statement about the longest lasting lamp in common indoor lighting is true?

Which statement about the longest lasting lamp in common indoor lighting is true?

• A. LED is the longest lasting lamp
• B. Incandescent is the longest lasting lamp
• C. Halogen is the longest lasting lamp
• D. Fluorescent is the longest lasting lamp

Answer: (A)

Lifespan in common indoor lighting is determined by how the technology fails over time. LEDs win here because they are solid‑state and have no filament that can burn out. They convert electricity to light with high efficiency and generate relatively little heat, so wear‑out mechanisms accumulate much more slowly. As a result, LEDs are typically rated for tens of thousands of hours, far surpassing other common options. Incandescent bulbs fail quickly because the tungsten filament gradually deteriorates and breaks, usually around a thousand hours. Halogen bulbs are a type of incandescent with a quartz capsule and higher operating temperatures, which extends life only modestly to a few thousand hours. Fluorescent tubes last longer than incandescent and halogen due to different failure modes like phosphor depreciation and ballast wear, but they still don’t reach LED lifespans, often in the range of several thousand to around ten thousand hours. Therefore, LED is the longest lasting option in everyday indoor lighting.

Lifespan in common indoor lighting is determined by how the technology fails over time. LEDs win here because they are solid‑state and have no filament that can burn out. They convert electricity to light with high efficiency and generate relatively little heat, so wear‑out mechanisms accumulate much more slowly. As a result, LEDs are typically rated for tens of thousands of hours, far surpassing other common options. Incandescent bulbs fail quickly because the tungsten filament gradually deteriorates and breaks, usually around a thousand hours. Halogen bulbs are a type of incandescent with a quartz capsule and higher operating temperatures, which extends life only modestly to a few thousand hours. Fluorescent tubes last longer than incandescent and halogen due to different failure modes like phosphor depreciation and ballast wear, but they still don’t reach LED lifespans, often in the range of several thousand to around ten thousand hours. Therefore, LED is the longest lasting option in everyday indoor lighting.