 Prompted by legislation in various countries mandating increased bulb efficiency, "hybrid" incandescent bulbs have been introduced by Philips.The "Halogena Energy Saver" incandescents can produce about 23 lm/W; about 30 percent more efficient than traditional incandescents, by using a reflective capsule to reflect formerly wasted infrared radiation back to the filament from which it can be re-emitted as visible light.This concept was pioneered by Duro-Test in 1980 with a commercial product that produced 29.8 lm/W.