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Author
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Topic: What would you light with a 24 kW HMI?
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Stephen Furley
Film God
![](http://www.film-tech.com/ubbmembers/1277b.jpg)
Posts: 3059
From: Coulsdon, Croydon, England
Registered: May 2002
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posted 05-16-2012 07:28 PM
Scott,
There were projection arcs which were similar in design to this; they were condenser arcs rather than reflector ones. Some eary Philips DP70s were fitted them, but I never saw one; I think they were Peerless Hi-candescent. Some follow spots also used a similar arrangement; I've operated one where the long positive came through a hole in the back of the lamphouse, so a longer positive could be used, but you had to put the arc out for a few seconds and re-trim to burn the second half.
The negative in the Ashcroft arcs was at a shallower angle, and this was claimed to be an advantage of them, but I can't remember why. The follow spot positives didn't rotate like the Ashcroft ones do. I'm not sure if the Brute ones do.
Quite a few years ago something was being filmed at St. Pancras station in London, now the terminal for the Eurostar trains, but then served by normal trains to the East Midlands; it was a rather quiet station then. The action was taking place on a platform, and the lights were near to the barrier line. No filming was taking place, I think it may have been a lunch break or something, but I was speaking to a friendly lamp operator. I remarked that you didn't see many of those now, and he let me strike the Brute which he'd just re-carboned. They must be much more expensive to run than HMIs.
Have you seen the picture of the filming of the opera scenes in 'This is Cinerama' at Teatro alla Scala in Milan? The very large arcs which were used to light those scenes were supplied by Mole Richardson, and were specially flown out from England. They also made some projection arcs, including the ones used on the handful of Kalee Vistavision machines ever built, and the more conventional Kalee machines used for the 34 mm presentation of 'Around the World in 80 Days' in London.
I want to see one of those 24 kW HMIs running. The lamp itself is surprisingly small; it doesn't look any bigger than a 12k one. The 12k one is claimed to produce 1.3 million lm, and since large discharge lamps tend to be more efficient than smaller ones the 24k version should be able to do slightly more than twice that. I've got a 70 W metal halide lamp in front of me at the moment, and even that's pretty bright.
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