47 CFR § 80.969
Illumination of operating controls
February 16, 2021
(a) The radiotelephone must have dial lights which illuminate the operating controls at the principal operating position.
(b) Instead of dial lights, a light from an electric lamp may be provided to illuminate the operating controls of the radiotelephone at the principal operating position. If a reserve power supply is required, arrangements must permit the use of that power supply for illumination within one minute.