The three letters H, L and S represent the classic colour variables of hue, luminance and saturation. Regardless of such identification, the system provides a possible application of Henry Munsell‘s system to the colours created on television screens by the process of phosphorescence. (Detailed text)

Date: No exact date; the system was developed in conjunction with television technology.

Basic colours: Red, green and blue

Form: Double cone

Application: Colour-order for phosphorescent television screens

Related systems: MunsellRGB

Bibliography: «Computer Graphics CAD/CAM Image Processing», Editrice il Rostro, Milan, 1981; David Travis, «Effective Color Displays», Computer and People Series, Academic Press, London 1991.