RLOD#25 (2020.05.31) 1999 Philips MSR 6000HR

Artificial daylighting on movie sets requires massive amounts of light that is usually produced by lamps of the kind shown here. The present MSR 6000HR was made by Kondo Electric Industry Co., a small specialized Japanese manufacturer who formed a joint venture with Philips from October 1992 to August 2006. The resulting company was renamed Kondo Philips Lighting Co Ltd in 1993, and Philips Lighting K.K. two years later. The Japanese made the larger MSR lamps for Philips while the latter concentration on the main range from 125 to 4000 W intended for general stage and studio lighting applications. The MSR 6000HR features a spherical burner filled with a Dy-Ho-Cs halide fill mix and a 24-mm arc gap that results in a plasma load of around 2.3 kW/cm. The fill chemistry is balanced for the production of artificial daylight at 6000 K with a CRI of 95 Ra8. The lamp has a nominal flux output of 570 klm, the result of a high lumen efficacy (95 lm/W), and it can be operated from 3700 to 6600 W with minimal changes to its light color properties. The latter characteristic is a consequence of a well balanced thermal management of the burner, achieved via a suitable profile of this vessel and the use of an outer jacket. The overall lamp construction is quite sturdy, with the wire frame held into place by small dimples in the quartz bulb. Sufficient electrical insulation is provided to enable the application of 25‒50 kV for the hot re-ignition of the arc.