1800W HMI light with electronic ballast, producing daylight-balanced illumination (5600K) for hard shadows and key lighting up to 10m.
Technical Details
The M18 operates with an electronic ballast unit, which provides the required ignition voltage of 20,000-30,000 volts and the operating voltage of 95 volts. The light source reaches an operating temperature of 750°C and an average burn time of 750-1000 hours. The fixture weighs between 8-12 kg depending on the manufacturer, with the associated ballast weighing approximately 15-18 kg. Modern variants feature flicker-free technology for high-speed shots up to 1000fps and DMX control for remote dimming between 50-100% of nominal power.
History & Development
ARRI introduced the first M18 in 1982 as a compact version of larger HMI systems, followed by K5600 and Desisti in the late 1980s. The breakthrough came in 1995 with the introduction of electronic ballasts, which reduced weight by 40% and eliminated flicker. In 2010, LED hybrid versions offered the first alternatives, while in 2018, the integration of Wireless DMX and app control set the current standard.
Practical Use in Film
Roger Deakins used M18 arrays for the prison scenes in "The Shawshank Redemption" (1994) to simulate harsh daylight through bars. As fill light in exterior shots, the M18 effectively compensates for shadow areas up to a distance of 8-10 meters. Indoors, it serves as an artificial sun through windows or as a hard backlight for silhouette effects. The quick setup (3-4 minutes) makes it ideal for documentary-style productions and handheld sequences.
Comparison & Alternatives
Compared to the M40 (4000W), the M18 offers better mobility with 65% less power consumption but achieves only 40% of the light output. LED panels like the SkyPanel S60 deliver similar lumen values with variable color temperature (2700-6500K), but without the pinpoint hardness of HMI light. Tungsten Fresnels in the 5K class produce warmer light (3200K) but require triple the power for comparable brightness.