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The lumen (symbol: lm) is the SI unit of luminous flux, which quantifies the perceived power of visible light emitted by a source. Luminous flux differs from power (radiant flux), which …

Understand lumens and how they measure brightness in lighting. Learn how to choose the right lumen levels for optimal lighting in every space.

Discover what lumens mean in lighting, how they compare to watts, and how to choose the perfect brightness for every room in your home or workspace.

The meaning of Lumens as a lighting measurement is the now the only way to accurately tell how bright your lighting fixture will be. This guide defines what is a lumen and what you need to …