What is illumination factor?
It may be defined as “the ratio of total lumens received on the working plane to the total lumens emitted by the light source”.
What is maintenance factor in illumination?
A lighting system’s maintenance factor indicates how much of the initial luminous flux remains available at the end of its service life. The maintenance factor must be determined by the planning lighting engineer and the new value of the luminous flux multiplied by it.
How do you calculate utilization factor in illumination?
Utilization Factor is Proportion of light reaching working plane to the light output of lamps. UF = Lumens received on Working Plan / Lumens output of luminaires. The lighting manufacturers’ catalogues give Utilization Factors for standard conditions.
What is illumination electrical?
Illumination is the luminous flux received by a surface per unit area. Its unit is Lux or metre-candle or. lumens per m2. Imagine a sphere of radius of one meter around a point source of one candela. This flux falls normally on.
How do you calculate illumination of light?
Lighting Calculation – Summary
- Use the light table to find out how many lux or footcandles you need.
- Calculate the amount of lumens you need. Multiply the area in square meters by the lux, or the area in square feet by the footcandles.
- Work out how many bulbs you need.
What is depreciation factor?
Factors are the percentages that are used to depreciate assets. … In progressive depreciation, the amount of depreciation increases each depreciation period. In digressive depreciation, the amount of depreciation per period decreases over time. In straight line depreciation, the depreciation is the same in each period.
On what factors does illumination depend?
Appropriate illumination levels depend on the size and contrast of the details being viewed, the age of the viewer, and other factors. Uniformity of task illumination is considered important to visual comfort, although the effect cannot be measured accurately. Shadows are a related factor.