How do we reasonably and scientifically meet the lighting conditions required by space sites when we design lighting solutions for our guests? If time permits and there is a computer, GE's EUROPIC lighting software can complete indoor lighting calculations and lighting. When there is no computer at hand, when the time is tight, the following quick estimation method can be used to quickly get the solution and cost budget, and the guests can quickly Timely adjustments are made to the timing of the plan or the budget for the cost.
First, we must learn the following table
North American Lighting Engineering Society IES Industrial Lighting Recommended Table
(Click on the image above to enlarge)
Second, the rapid estimation method uses the following assumptions as a calculation premise
1. The maintenance lumen value on the work plane is half that of the new light source in the new fixture.
For example, if the luminous flux of the lamp is 3200Lm, the lumen value is maintained = 3200*0.5=1600Lm
2. The size of the room to be illuminated is general. The reflection coefficient of the room surface coefficient is normal, and the dust in the room is normal. (A room of normal size means: the height value from the working plane to the lower part of the lamp. MH ).
3. Only one type of luminaire is used for a given room (high-hanging luminaires can be used when the height MH of the working plane to the lower part of the luminaire is greater than 6 meters, and low-hanging luminaires can be used when the MH is less than 6 meters)
Third, the calculation process
1. Find the illuminance value A of the application place from the IES Industrial Lighting Recommendation Value Table (see table) of the North Lighting Engineering Society.
2. Obtain the lumen value B of the light source from the light source supplier.
3, the rated source lumen value B multiplied by 0.5 to get the light source to maintain lumens C
4, 
5, 
6. When using high-hanging luminaires, the luminaire spacing S is greater than the suspension height; or when using low-hanging luminaires, the luminaire spacing S is greater than 1.5 times the suspension height, (the suspension height is: the working surface to the height below the bottom of the luminaire MH), if If the interval S of the lamp is too large, the light source with a lower power level should be selected, and the third step should be repeated until the interval S of the lamp meets the requirements.
7. Principle of lighting: The luminaire should be unfolded from the middle to the boundary. When the row or column of the luminaire is odd, there should be a row or a column of lamps on the center line. When the row or column of the luminaire is accidental, the nearest luminaire The distance from the centerline should be half of the interval S of the luminaire. The distance from the wall closest to the wall is less than or equal to 0.5S.
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