lumencsökkenés

Lumencsökkenés, a Hungarian term, translates to "lumen decrease" or "dimming" in English. It refers to the gradual reduction in the amount of light emitted by a light source over its operational lifetime. This phenomenon is particularly common in older lighting technologies such as incandescent and fluorescent lamps, but also affects modern LED (light-emitting diode) lighting to varying degrees.

The primary reasons for lumencsökkenés in traditional bulbs include the degradation of the filament (in incandescent lamps) or the phosphors (in fluorescent lamps). As these components age, their ability to produce light diminishes. For LEDs, lumencsökkenés is often attributed to the degradation of the semiconductor materials within the diode, as well as potential issues with the driver electronics or thermal management.

The rate of lumencsökkenés can be influenced by several factors, including the quality of the lamp, the operating temperature, the number of on-off cycles, and the voltage fluctuations. Manufacturers typically specify the lumen maintenance of their products, often expressed as L70 or L90, which indicates the time in hours at which the light output will have decreased to 70% or 90% of its initial level, respectively. Understanding lumencsökkenés is crucial for lighting design and maintenance, as it impacts the long-term illuminance levels in a space and dictates when light sources may need replacement to maintain adequate lighting conditions.