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Lighting : April May 2011
72 LIGHTING MAGAZINE | April/May 2011 STRAPHEAD IN HERE TECHNICAL FEATURE use dimming to remote control large groups of luminaires to allow them to be “saved” during takes. As in a commercial application, this “saving” or turning off or down saves a large chunk of input energy for both lighting and HVAC. It also has the benefit of saving overheating crew and actors who often have to bear the brunt of large lighting heat loads in studios. The Source 4 family of fixtures and the other brands of similar technology from Altman Lighting and Strand Lighting were the first luminaires to actively tout their energy saving abilities. In the US in the early 1990s electric utility companies were supplying these fittings free of charge to large theatres to save peak demand loading in the evenings. At the same time they were giving CFLs to their domestic customers. In a 200 to 300 lamp Broadway show lighting rig these 575W fitting were typically replacing 1kW luminaires and achieving equivalent lighting levels. In the US particularly, a high proportion of lighting equipment is hired for the duration of the show. This allows faster re investment and quicker uptake of new technology. By the mid to late 1990s these luminaires became a default standard for US theatrical productions. By the nature of the international entertainment business, these shows began touring and requiring this new technology all around the world. By this means the savings and benefits of these luminaires became standard around the world. The 80 volt standard pioneered by Selecon has been slow to take off but is now gaining more acceptance as other luminare manufacturers see the benefits of this technology (see Figure 1). It is early days, but I predict a large uptake of this technology for specific applications in the near future. As I mentioned metal halide lamps have become ubiquitous in a number of areas of the entertainment business. We have seen major gains with the increasing efficiency of sources, the ability to tolerate higher pinch seal temperatures and increased optical efficiency. Ten years ago where we would have used a 1200W lamp we are now using a 500W lamp, with a greater total lighting output. In addition we can have more effects and control within one luminare which can displace several others from the lighting rig. A recent country-wide tour by the National Opera Company used 8 moving lights in their overhead rig – they replaced probably up to 40 conventional luminaires. This resulted not only in the saving of electrical energy but setup time and transportation costs. FIGURE 2. Arcola Theatre provided lighting for the entire Theatre Arena using a mixture of LED and low power tungsten technologies; cutting power consumption by over 70%. A 5kw Gencore fuel cell, powered the lighting rig, using hydrogen. The fuel cell operates almost silently producing nothing but electricity and clean water. ... WE CAN HAVE MORE EFFECTS AND CONTROL WITHIN ONE LUMINAIRE WHICH CAN DISPLACE SEVERAL OTHERS FROM THE LIGHTING RIG.
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