Lumen is the unit used to measure the luminous flux or total amount of visible light emitted by a source. It quantifies brightness and is crucial in lighting design for security applications.
A (Pixel) relates to image resolution.
B (Watt) measures energy consumption, not light output.
D (Fresnel) refers to a type of lens used to focus or direct light.
[References:, PSP Study Guide – Lighting Measurement and Application, POA Manual – Lighting Design for Security]
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