The illuminance meter is composed of a photometric head (also known as a light-receiving probe, including a receiver, a V(λ) pair filter, and a cosine corrector) and a reading display.
3. The relationship between the chamber shape index and the number of measuring points
Chamber shape index Kr minimum number of measurement points Chamber shape index Kr minimum number of measurement points
<1 4 2～3 16
1～2 9 ≥3 25
In the formula, L and W are the length and width of the room, and hr is the height from the lamp to the measuring plane.
When supplementing general lighting with local lighting, the illuminance of the working point should be measured according to the normal working position of the person, and the photocell of the illuminometer should be placed on the working surface or the operating surface for visual work.
