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.
It would be preferred that the lighting was adjustable according to each individual worker. Older employees need significantly more light than younger ones. On average, the eyesight of a 60-year-old is roughly half of the eyesight of a 20-year-old. A 60-year-old needs 12 times the lighting level that a 20-year-old would need, to achieve the same effect.