One of the important factors for work environment and able to give satisfaction and high productivity for employee is a good lighting. For instance, in a mill division, a good lighting will make a safe work place and support work to see things and also reduce mistakes. Efficiency of an operator is determined by constancy in seeing and working. A good lighting can increase work effectiveness and can give the bigger safety.
Many concepts, terms, and units relate to the measurement of illumination. The basic theory applies to a point source of light (such as a candle) of a given luminous intensity, measured in candelas (cd). Light emanates spherically in all direction from the source. The amount of light striking a surface or section of this sphere is termed illumination or illuminance and is measured in foot-candles (fc). Some of that light is absorbed and some of it is reflected (for translucent materials, some is also transmitted), which allows humans to “see” that object and provides a perception of brightness. The amount reflected is termed luminance and is measured in foot-Lamberts (fL). It is determined by the reflective properties of the surface, known as reflectance.
The characteristics of good lighting are having:
1. Enough ray/light
2. The ray/light is not temporarily or cause a glare
3. There is no incisive contrast
4. The bright of light (Brightness)
5. Light distribution, shadow and light radiating/spreading
6. Color
The good lighting is one of the factors to give good sight condition. There are some other factors that influence the power to see. Some of them are related to work physical factor and work place, beside the other aspect like weariness/fatigue and speed in give reaction.
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