The amount of luminous flux (lumens) still being emitted at a given time (in hours) during the life of LEDs. This varies between different type and quality of LEDs and the characteristics of the luminaire, particularly the temperature at which the LEDs are operated. Expressed as L and B percentages at a specific number of […]
Downlights that are recessed into a ceiling with a fire rating must have the same fire rating as the ceiling. In domestic installations, the ratings under BS 476 are 30,60 and 90 minutes. Each rating must be tested as the ceiling construction is different. Therefore, a 90 minute rated product does not automatically comply with
A ratio expressing the luminous efficacy of a light source or luminaire. Expressed in lumens/ Watt.
