Daylight sensors that adjust lamp brightness based on the presence of natural light can greatly reduce lighting energy loads. On average, commercial buildings use 25% of their energy for lighting. Dimming ballasts are more expensive up front and complicat

Daylight sensors that adjust lamp brightness based on the presence of natural light can greatly reduce lighting energy loads. On average, commercial buildings use 25% of their energy for lighting. Dimming ballasts are more expensive up front and complicated to specify than stepped ballasts. However, stepped lighting is considered less attractive because the dimming is not gradual and can be distracting to occupants but can do an excellent job reducing energy use.