Why do light bulds do not last as long?

Light bulbs may not last as long due to factors such as heat buildup, voltage fluctuations, and frequent on-off cycling. Incandescent bulbs, for example, generate a lot of heat, which can shorten their lifespan. Additionally, poor-quality materials and manufacturing defects can lead to premature failure. In contrast, LED bulbs are designed to be more energy-efficient and have longer lifespans.