LTM Luxarc: HMI daylight fresnel fixture by Lighting Technology & Media, delivering high output for exterior shoots.
Technical Details
LTM Luxarc luminaires are available in power classes from 200W to 18,000W, with common models including 575W, 1200W, 2500W, and 4000W. A 2500W Luxarc produces approximately 200,000 lumens with a power consumption of 21 amperes. The units use Fresnel lenses with diameters ranging from 4 to 12 inches and offer a beam angle from 12° to 65° (spot to flood). The cooling system uses axial fans, maintaining operating temperatures below 85°C. Electronic ballasts regulate the ignition and operation of discharge lamps at frequencies of 200Hz or higher for flicker-free shooting.
History & Development
LTM developed the first Luxarc models in 1982 in Munich in response to the growing demand for daylight-equivalent light sources in filmmaking. HMI technology itself originated from OSRAM (1969), but LTM optimized the luminaire housings for film productions. In 1987, LTM introduced electronic ballasts, which eliminated the characteristic 50Hz flicker. The Luxarc series became particularly established in Europe and was also used in Hollywood productions from 1995 onwards. Modern versions integrate DMX control and silent ballasts for low-noise operation.
Practical Use in Film
Luxarc luminaires primarily serve as artificial sun replacements for exterior shots or for simulating daylight indoors. For "Das Boot" (1981), Jost Vacano used early LTM prototypes for the underwater scenes. The high light output allows for illuminating large sets – a 4K Luxarc still effectively penetrates diffusion material at a distance of over 6 meters. Typical setups combine multiple Luxarc units with Chimera softboxes or units positioned through windows for natural-looking daylight. Disadvantages include the 2-3 minute warm-up time and UV radiation, which requires protective filters.
Comparison & Alternatives
Luxarc luminaires compete with ARRI M-Series HMIs and Mole-Richardson Daylight systems, but differ in their modular ballast system and European 230V optimization. LED panels like ARRI SkyPanel or Litepanels Gemini are increasingly replacing HMI technology due to lower power consumption, instant readiness, and variable color temperature. However, Luxarc remains relevant for applications with extreme lighting requirements – its luminous efficacy per watt surpasses current LED systems by a factor of 2-3. Plasma lights like K5600 Joker offer similar performance in a more compact design but do not achieve Luxarc's light output for large productions.