Lighting helps us focus on objects and transfer them into images. However, the ideal level of light varies according to where we are, whether indoors or out, or what tasks we are doing. The level of light is measured in lux, which can be equal to watts per square meter.
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20 to 50 Lux
When you are outside a building or going for a walk, the illumination does not need to be more than 20 to 50 lux. This will give you enough light to do basic activities like walking from one place to another, or working with objects that are easy to see. If you are working in a car factory, the light level for assembling the frames of cars can be 50 lux.
When you are indoors, and doing only occasional tasks or in a room waiting for a movie to start, then the level of light needs to be higher than when you are outdoors. Lighting level requirements must be from 50 to 200 lux. If you are working in a car factory, then a light level of 200 lux is necessary for inspecting the car once it's built.
250 to 750 Lux
This range of lighting is required when you are working indoors. The level of activity dictates the requirements for lighting level. If you are attending classes or performing light office duties such as filing, then the light levels can be on the lower scale. However, if you are working on computers, in a supermarket or a workshop, then the level needs to be increased to 750 lux.
750 to 1500 Lux
When you are doing drawings that are detailed or working with small items that are difficult to see in lower light, then you will need light levels of 750 to 1500 lux.
1000 to 2000 Lux
The highest light level requirement, up to 2000 lux, is necessary when you are performing tasks that require a lot of concentration for long periods of time. Unless you have a bright environment in which to work when you must work for eight or more hours a day, your eyes will experience strain if the light level is not 2000 lux.
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