The Energy Saver high volt lamps were newly developed & designed. Basic principle is an optimised filament/spiral design & Xenon technology as well. With the low-voltage lamps OSRAM provides the approved & proven IRC-Technology based on the principle of heat recovery. Through a special coating (Infra-Red-Coating) on lamp flask, the beamed heat reflected again from the filament & remains there in the lamp. Thus, lesser energy from outdoor must be supplied in order to bring the filament to operating temperature.