Ace 18 W 4.45 in. L Fluorescent Bulb Cool White Biax 4100 K 1 pk

A fluorescent bulb is an energy-efficient lighting option commonly used in residential, commercial, and industrial spaces. These bulbs emit light through the process of fluorescence, where an electric current excites mercury vapor inside the tube, causing it to emit ultraviolet (UV) light. This UV light then excites the phosphor coating on the inside of the bulb, which emits visible light. Fluorescent bulbs are widely recognized for their long lifespan and energy efficiency compared to traditional incandescent bulbs.