How to gain a 5% Productivity increase

Forget LEAN consultants and changes to workflow! The hands-down best way to increase productivity is by providing the workers with the light that they require to do the job.

Poor lux-levels = Poor productivity ?
 Good lux-levels = Good productivity ?

Below are real-life case studies:
 1) Manufacturing facility
Lux-levels from 500 ➡️900-lux Productivity = +7.7% ?

2) Packaging facility
Lux-levels from 350 ➡️2,000-lux Productivity = +3.8% ?

3) Factory Hall
Lux-levels from 450 ➡️800-lux Productivity = +5.5% ?

4) Office
Lux-levels from 200 ➡️500-lux Productivity = +6.0% ?

Apart from higher productivity, we also noted two other significant results:
✅Less errors/returns
✅Lower absenteeism