Good lighting is user-oriented. It also increases congeniality, health, safety and productivity. Poorly functioning lighting disturbs concentration and can cause mistakes and even dangerous situations.
In a good workspace, the lighting level and colour temperature is sufficient and adjustable and the lighting is even and anti-dazzling. Therefore the light isn't unpleasant for the eyes, doesn't reflect from a screen or a counter and there are no reflective surfaces between the viewer and other viewed objects.
The lighting should be adaptable to the employee. Older workers need significantly more light than younger ones. Visual acuity in the 60s is on average half that of a 20-year-old. The 60-year-old needs 4 times the light intensity to get the same visual impression as the 20-year-old.