The facility managers of Terminal One at San Francisco International Airport in California wanted to give the high-volume concourse a modern and forward-thinking look. The terminal, which serves AirTran, Alaska Airlines, Delta, Frontier, Southwest and US Airways, had illumination issues caused by aging four-tube linear fluorescent troffers. The check-in stations were not properly lit and had poor illumination on work surfaces where agents process paperwork. The overall terminal looked dim and muted.