On Finelite's manufacturing floor, much of its lighting assembly process is controlled by - you guessed it - lights. Multicolored lights raised on poles line the workstations, flashing white if a worker needs a part and blue if the fixture is finished. Sometimes all the lights flash and play a short tune, indicating that a worker needs help. These coded lights help bring order to Finelite's complicated process of building customized, energy-efficient light fixtures for offices, classrooms...