Fluorescent and LED grow light bulbs have varying lifespans depending on the type and quality of the bulbs. Fluorescent bulbs, such as compact fluorescent lamps (CFLs), generally last around 10,000 to 20,000 hours of use. However, their light output may decline over time, necessitating replacement every 1 to 2 years for consistent plant growth. On the other hand, LED grow light bulbs have a significantly longer lifespan, ranging from 25,000 to 50,000 hours or more. With proper maintenance and usage, LED grow lights can last several years before needing replacement. Their extended longevity and energy efficiency make LED grow lights a popular choice for indoor gardening and sustainable plant cultivation.