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Topic: Heat issues version 3
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Sam Hunter
Jedi Master Film Handler
Posts: 779
From: West Monroe, LA, USA
Registered: Jan 2002
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posted 09-30-2002 11:39 PM
My lamphouse project is basically complete but I am worried I may have a major heat issue with it. I am using an EKD bulb 120V, 650 Watts with a 6" Ellipsoidal reflector. At the second focal point about where the aperture would be the light beam is pretty intense and quite hot. It is hot enough to turn a chrome-plated ruler blue. I really do not want to hook this thing up to my BX80 and burn a hole through it and melt or burn film. Although I would think a 7K lamphouse would heat the aperture up about the same and with the unit running it should cool it down. I just don’t know and need some input. I may back down the lamp wattage about 100 watts or so.
Here are some photos of my setup for reference.
Broke one of the rules on this one.
Brad will push the reject button if I am not careful.------------------
Samual Hunter Sr. KC5ZSL
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Aaron Sisemore
Flaming Ribs beat Reeses Peanut Butter Cups any day!
Posts: 3061
From: Rockwall TX USA
Registered: Sep 1999
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posted 10-01-2002 01:05 AM
You may need to get a dichroic filter for the snood of your lamphouse- this will block much of the infrared emission from the lamp, thereby cooling the beam.Additionally, you may not have to have the beam 'pinpointed' at the aperture in order to to get an even illumination. Once again, the IR is less concentrated. If things are still too hot, water cooling of the gate is the next logical step. -Aaron
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John Pytlak
Film God
Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 10-01-2002 01:42 PM
Tungsten-halogen lamps have proportionally more infrared heat energy than xenon arc lamps. If you can fit it into your optical path, an angled dichroic filter that reflects the IR to a heatsink would work well. A heat absorbing glass (like the old Pittsburgh 2043 filter) works well too, but absorbs rather than reflects all the IR energy, so it gets really hot!Don't forget that the film is moving by at 24 frames per second. You need to reach some pretty hefty power levels before you damage movie film. ------------------
John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services, Entertainment Imaging
Research Labs, Building 69, Room 7525A
Rochester, New York, 14650-1922 USA
Tel: +1 585 477 5325 Cell: +1 585 781 4036 Fax: +1 585 722 7243
e-mail: john.pytlak@kodak.com
Web site: http://www.kodak.com/go/motion
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