This very low profile , 1" deep fluorescent undercab series, is available in 12 1/4", 21 1/4", 24 1/2", 33 1/2", and 42 1/2" lengths. These lights are ideal for concealed undercabinet installation. These fluorescent undercab lights are equipped with a power factor corrected 120V electronic ballast which operates 60% cooler than a conventional preheat ballast.