Most energy savings will be achievable in the future only through innovations in professional lighting. This market constitutes about 70% of the energy consumption in lighting, and includes lighting in industry, commerce and public areas; it is still a rapidly expanding market.
Flourescent lamps and high intensity discharge (HID) lamps are the workhorses in this field, and will remain so in the near future. HID lamps (containing tungsten electrodes) are the most efficient light sources and are used wherever brilliant light, together with a long lifetime and energy efficiency, are important. Longer maintenance intervals of lamps will provide considerable cost savings in relamping. Recently, the first mercury-free headlamp systems were introduced in the automotive industry and further substitution of mercury or amalgams by harmless additives in new lighting systems will surely occur.