What type of tanning equipment features lamps aligned both above and below?

The type of tanning equipment that features lamps aligned both above and below is indeed tanning beds. Tanning beds are designed to provide an even tan by utilizing UV lamps positioned both on the top and the bottom. This configuration allows for balanced exposure to UV rays, helping to achieve a uniform tan on the entire body.

This setup is essential for maximizing tanning efficiency and minimizing the chance of uneven tanning, which can occur if only one side is exposed to UV light. In contrast, sun booths typically allow for stand-up tanning with lamps placed around the user, while UV cabinets are often meant for providing a concentrated exposure in a specific area. Portable tanning units typically do not use UV lamps and instead focus on spray tanning. Thus, tanning beds are unique in their dual-lamp design, contributing to their popularity in tanning salons.