The ARRI 1800W SE HMI Lamp represents a new power class of lamp. Designed to be used in the ARRI M18 and ARRISUN 18 lampheads, the 1800W SE HMI produces 1800 watts, has an average life of 750 hours, a luminous efficacy of 92 lumens/watt, and a Color Rendering Index greater than 90 at 6000°K. This lamp operates at 18.5A.
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Insane quality.
these lamps usually last around 700 hours. Thank God the m18 lamp head comes with an actual counter to let you know when you are close. Somewhere around 500 hours, I would buy a replacement bulb. just keep it with you handy in case you blow a bulb.one quick gaffer trick is to throw a scrim between the lamp lens and the barn doors when you shut off the light in cold weather so you don't crack a glass on the lamp, or blow the bulb. the theory is that the metal in the scrim will help the glass to cool down at a slower rate.