RLOD#8 (2020.05.12) 1995 Philips MSR 1200 HR

Philips introduced its MSR line of compact double-jacketed metal halide short-arc lamps in 1988 at Photokina in Cologne, West Germany. The initial series included three lamps rated at 400, 700, and 1200 W, and were the result of a major redesign of the company's SN lamps, whose fill chemistry was changed from tin halides to a mix of rare earth halides (primarily dysprosium based). The improved energy efficiency of the electrical arc resulted in a rerating of the lamps to higher wattages, resulting in much brighter sources. The 1200 W MSR, which radiates 110 klm, originates from the SN 660W which emits 40 klm only, corresponding to a 275 % increase in light output. The benefit of combining the double-jacketed design of the SN with the efficient rare earth fill chemistry results also in a very flexible operation as the input wattage can be varied from 40 % to 117 % of nominal level without resulting in any significant change in light color temperature (around 5600 K) while the color quality remains excellent (around 95 R8). The MSR 1200W HR shown here is a later variant released in 1989, designed with a larger G38 end cap and some additional internal electrical insulation enabling the application of extremely high voltages for the instantaneous hot restrike of the lamp.