The following example shows the potential of lighting control. Where obsolete office lighting with standard fluorescent lamps and conventional ballasts is replaced by modern light sources and electronic ballasts, energy consumption falls by around 55 percent. But if presence and daylight control systems are also used, the savings can be as much as 80 percent (see fig. 32). What is more, compliance with the ever stricter energy consumption limits that apply in the EU is virtually unachievable without electronic control.