You will be given a definition of a task first, then some input of the task.
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Tanning salons claim to use a "safe" form of uv (ultraviolet) light, with a longer wavelength than that in sunlight.
Output:
Tanning salons claim to use a "safe" form of what light, with a longer wavelength than that in sunlight?