The fractional remainder of task illuminance due to all combined lumen depreciations including LDD, LLD, and RSDD.
light loss factor. A factor used in calculating the illuminance after a given period of time and under given conditions. It takes into account temperature and voltage variations, lamp depreciation (of electric luminaries), dirt accumulation on luminaire and room surfaces, maintenance procedures and atmosphere conditions. Formerly called maintenance factor.
LIGHT LOSS FACTOR. Factors that allow for a lighting system's operation at less than initial conditions. These factors are used to calculate maintained light levels. LLFs are divided into two categories, recoverable and non-recoverable. Examples are lamp lumen depreciation and luminaire surface depreciation.
A factor used to calculate the illumination after a certain time according to whatever conditions are present. (Like varying temperature, fluctuating voltage, atmospherics, dust buildup, and maintenance procedure, if any). This used to be referred to as the Maintenance Factor.
Light Loss Factor. A factor used in calculating the level of illumination that takes into account such factors as dirt accumulation on luminaire and room surfaces, lamp depreciation, maintenance procedures and atmosphere conditions.