What is Light Center Length (LCL)

Horace He

Last Updated: September 3, 2023

What is Light Center Length (LCL)

Light Center Length (LCL), also known as “LCL” for short, is the distance from a specific reference point on a lamp base to the center of the light source, such as a filament or arc tube. This measurement is crucial for proper positioning and alignment of lamps within luminaires, ensuring optimal light output and performance.

In North America, the LCL of bulbs is typically measured in inches, while other countries use millimeters. The LCL measurement may vary depending on the lamp type and model, as different lamps have different designs and configurations that can affect the distance between the base and the light center.

Knowing the LCL is essential for lighting professionals as it helps determine the position of the light source within a luminaire or fixture. This information allows for precise calculations and adjustments in lighting design, ensuring the desired lighting effect is achieved. Additionally, the LCL measurement is crucial for avoiding issues such as glare or uneven lighting distribution.

It is important to consult the manufacturer’s specifications or product documentation to obtain the accurate LCL measurement for a particular lamp. By considering the LCL, lighting professionals can ensure proper illumination and optimize the placement of lamps in relation to reflectors, diffusers, and other components of the luminaire.

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