During the working day, lighting supports employees in their work. The visual, biological and emotional effects of lighting should be considered. Modern lighting concepts make working easier: good lighting increases concentration, reduces fatigue and is bright enough for all visual tasks, including tasks performed by aging employees. The minimum value for brightness at eye level should be met by a sufficient vertical lighting level. Higher lighting levels and the right spectrum composition help to maintain the performance for a longer period of time. A study by CBRE in offices showed an improvement of 12% in task performance with circadian lighting.
Going outside for a short, 15-minute walk helps beat post-lunch laziness.
Even on a cloudy day, you can get up to 10,000 lux when outside, whereas in an office you will typically only get 500 lux.