Luminance isn't just about light being bright; it's about its measurable quantity from an area. The luminance of the moon is lower than that of the sun.
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Area Specific
Luminance refers to light from a specific area, which can be measured differently than overall brightness. The luminance of a projector screen is important for viewing clarity.
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Technical Term
Luminance is used in technical contexts like physics, lighting design, and engineering. The engineer measured the luminance of the LED panel.