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The ratio of reflected flux to incident flux.

Flux - The time rate of flow. For example, volume per hour is the flux of a fluid.

Reflectance also is called Light reflection Value. In lighting design, we need to consider all reflectance for proper lighting simulation to real time environment. In general, wall, floor, ceiling reflectance will be 50%,80%, 20-40%. It also depends on painting color of room

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