This measure consists in orienting the workplace to maximize the use of natural light and ensuring that no glare occurs. The most suitable option is by letting the light arrive sideway to the workplace.
It is possible to get a more pleasant working environment
If glare is avoided, the closing of curtains, blinds or other items which block out the sunlight is consequently avoided
There will not be need of using artificial light
It is closely related to the location of windows, skylights and other natural light entrance, thus its potential is limited by the initial design of the building
The cost is zero.
References and best practices
Lighting control strategy for energy efficient office lighting system design: