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In regards to the use of the Lumen method, explain how a designer may decide and...

In regards to the use of the Lumen method, explain how a designer may decide and measure how much artificial light is required in a room (where there is also a window providing natural light and the room is only used during the daytime).

Engineering   Civil-Engineering   
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Lumen method is a method known for light design, it is also known as zonal cavity method as that room provided would act as a cavity. It is a simple method to calculate the light level in a room. It uses illuminance criterias for estabilising an uniform luminaire layout. Here in the given question the source of light is artificial light. Below is the formula given for lumen method for obtaining the light required with description. The different factors may be given as per the condition or size of room.

A = Area of room that is to be lit

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