Energy-saving floodlights with mhdischarge lamps for indoor or outdoor lighting. They are about five times as bright as halogen lamps of equal power. The bulbs have an extremely long lifetime (6000 - 15,000 hours compared to incandescent lamps, with only about 1,000 hours)For operating discharge lamps require an ignitor and a ballast, which is usually integrated in each light fixture. Only bulbs with the specified power my be used in the spotlights. Discharge lamps are not dimmable.After switching on, it takes about 2 minutes to reach their full brightness. NAV, HSE b> = sodium-vapor lamp produces light yellow, HQI MH, HIE, HPI b> = Low-emission metal vapor discharge lamp for white light. HQL, HPL, HME b> = mercury vapor discharge lamp for white light.