" Luminous Hands and/or Hour Markers"- is a standard feature on most watches. The hour markers and/or hands have a coating of "Glow in the dark" which will illuminates in the dark so you can tell the time where there is insufficient light.
1. In general, pertaining to the emission of visible radiation. 2. In photometry, a modifier used to denote that a given physical quantity, such as luminous emittance, is weighted according to the manner in which the response of the human eye varies with the wavelength of the light.
An ink, which exhibits fluorescence or phosphorescence. 1) Fluorescent ink: contains pigments which are capable of absorbing energy from the blue or ultra-violet end of the spectrum and re-emitting it in the form of light in the visible wavelengths. A fluorescent ink ceases to glow if the active source is removed. 2) Phosphorescent ink: contains pigments (phosphors that absorb energy at one wavelength and emit it over a wavelength in the visible spectrum. It differs from a fluorescent ink in that it continues to glow for a time after the stimulating source has been removed.