A factory here, a few decades ago spend 150 k to select a color scheme for maximum productivity. No one believed in it but one investor insisted because he used the service before and the consultant had a lot of numbers to show.

50 cm above the floor the wall had 6 washed out grayish colored bars 20-25 cm width with green and orange slightly brighter. I didn't notice a productivity gain but it did allow excellent peripheral vision.