The Sylvania 120RB series is a line of medium-base fluorescent lamps with a medium-bi-pin(R17d) base type. The lamps are 40 watts, 120 volts, and come in a variety of daylight and warm white colors. They provide excellent color rendering, reduced glare, and an extended life, which makes them an ideal choice for a range of applications. These lamps are perfect for use in residential and commercial lighting applications due to their long life and low energy consumption. They are commonly used in modern offices, retail stores, and other spaces where quality lighting is essential.