A measure of how a lamp maintains its light output over time. It may be expressed as a graph of light output vs. time or numerically. Lux: The ratio of lumens to surface. Measures the light that actually reaches the target. Lux varies depending upon how far away the target is from the light source and other environmental factors such as wall color, reflectors, etc.
A measure of how well a lamp maintains its light output over time. It may be expressed numerically or as a graph of light output vs. time.
The lumen output provided by a lamp at a given point or percentage of its life.
The remaining flux percentage at the rated life of a light source.
The ability of a lamp to retain its lumen output over time. Greater lumen maintenance means a lamp will remain brighter longer. The opposite of lumen maintenance is lumen depreciation, which represents the reduction of lumen output over time. Lamp lumen depreciation factor (LLD) is commonly used as a multiplier to the initial lumen rating in illuminance calculations to compensate for the lumen depreciation. The LLD factor is a dimensionless value between 0 and 1.
A measure of how a lamp maintains its light output over time. It is often expressed as percent initial lumens vs. percent rated life.
How a lamp maintains its original brightness over its life.
Same as "Light Loss Factor."
