An electric lamp has an envelope with an inner surface and two electrodes located at each end of the envelope. The electrodes transfer electric power to generate ultraviolet radiation in the envelope which is filled with mercury and a charge sustaining gas. The inner surface of the envelope is pre-coated with an aluminum oxide layer to reflect ultraviolet radiation back into the envelope. A phosphor layer is formed over the aluminum oxide to convert the ultraviolet radiation to visible light. The phosphor layer is a mixture of four phosphors, namely, blue-luminescing Blue Halophosphate (BH), red-luminescing Yittrium Oxide (YOX), 2900K-luminescing Calcium Halophosphate, also referred to as Warm White Halophosphate (WW), and green-luminescing Zinc Silicate (ZS).

Una lámpara eléctrica tiene un sobre con un superficial interno y dos electrodos situados en cada extremo del sobre. Los electrodos transfieren energía eléctrica de generar la radiación ultravioleta en el sobre que se llena de mercurio y de un gas que sostiene de la carga. La superficie interna del sobre se cubre primero con una capa del óxido de aluminio para reflejar la radiación ultravioleta nuevamente dentro del sobre. Una capa del fósforo se forma sobre el óxido de aluminio para convertir la radiación ultravioleta a la luz visible. La capa del fósforo es una mezcla de cuatro fósforos, a saber, Halophosphate azul azul-luminescing (BH), óxido rojo-luminescing de Yittrium (YOX), 2900K-luminescing calcio Halophosphate, también designado Halophosphate blanco caliente (WW), y el silicato verde-luminescing del cinc (ZS).

 
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