GE funded the NRC of the National Academy of Sciences to study how worker productivity is tied to lighting during a 1924 Illumination Study:
  1. Turn Up the Lighting Slightly and Productivity Goes Up
  2. Dim the Lighting Slightly and Productivity Goes Up
  3. Productivity Stays the Same in Both Cases
  4. Productivity Goes Up in Both Cases
  5. Productivity Goes Down in Both Cases