Some of the older tanning beds use a very different sized lamp, the F72. This includes some of the 1980s versions of the Sun Industries "Suntana" that came with Crystal Sun S tanning lamps, Puretan's "TanFit" tanning bed, and others. Most tanning lamps sellers have either never heard of F72, or just don't stock them. Instead, we offer you choices and sell them at the same price we sell our other sizes, so you don't pay a penny more. One of the benefits of working with TanningLamps4Less, helping you since 1985.