Energy saving luminaires with discharge lamp technology for hall- or outdoor-lighting. They are aprx. 5 times brighter than quartz lights in the same power range. Further the lamp life duration is very long (6,000 - 15,000 hours in comparison to incandescent lamps with only 1,000 Std.) The light bulbs have to be ordered separately. LEGEND: HQI, HPI, HTI, MH, HIE = Metal halide discharge lamp - White light, good colour rendering. (galeries, working areas) HQL, HPL, HME = Mercury discharge lamp - White light, medium light quality. (Street lighting, factories) SON, NAV, HSE, HPS = Sodium pressure lamp - yellow light, highest efficiency. (Street lighting or illumination of historical buildings)