Osram has recently renamed its rugged and compact HSD lamp to the 4ArXS HSD lamp series.
The 4ArXS(For Architainment eXtreme Seal) HSD are powerful metal halide lamps with innovative eXtreme Seal technology. This technology makes them extremely durable allowing them to withstand pinch seal temperatures up to 450°C, compared to conventional maximum temperatures of 350°C. The 4ArXS HSD are available in wattages of 150W to 1200W and have a high luminous efficacy of up to 90 lm/W with an arc length of 5mm in the 150W and 250W versions and 7mm in the 575W version. The 4ArXS lamps are suitable for creative architectural and effect lighting, including for events, nightclubs, and theatre venues.