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This topic comprises 2 pages: 1 2
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Author
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Topic: Converting Marc 300 projectors.
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Stephen Furley
Film God
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Posts: 3059
From: Coulsdon, Croydon, England
Registered: May 2002
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posted 02-16-2003 02:29 PM
I have a pair of Bell & Howell 666 16mm projectors, which use the GE marc 300 lamp. These lamps are expennsive to operate, due to the very short life, and are becomming difficult to obtain.
A couple of years ago someone suggested a Sylvania metal halide lamp as a replacement, I can't remember the number, but it would have been too long to fit in the lamphouse; it might be able to replace a marc 350, which is a different shape to the 300.
There are now many small LCD data/video projectors which use metal halide lamps similar in size and shape to a marc 300, and with a life of about 2000 hours, for a cost not much greater than that for a marc 300.
Does anyone have any thoughts on the possibility of converting projectors to use such a lamp? What modifications would be necessary to the power supply, etc.?
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Stephen Furley
Film God
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Posts: 3059
From: Coulsdon, Croydon, England
Registered: May 2002
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posted 02-18-2003 11:32 AM
Brad wrote:
quote: Stephen, if you are unsuccessful changing out the kind of lamp, go to www.bulbdirect.com and click on "search" and enter "marc" and these bulbs will turn up. This place generally has good pricing. Unfortunately the webmaster doesn't know how to code properly, so you'll have to use Internet Explorer.
Brad, I've seen some GE lamps marked 'Gemini', they were similar to the normal Marc 300/16, but they were smaller, not much larger than the EJL/ELC type halogen lamps. Is there a full size 'Gemini' as well?
The 666s are not the best of machines, but they are bright, brighter than a 300W portable xenon, and, they are small and light, which is important for me, as I don't have a car. I can take one projector plus its power supply to a venue by bus, if I need both machines then I have to make two trips. They are usable, if not bright, on screens up to about five or six metres, enough for the sort of places I deal with, various halls, and cinemas which only have 35mm, and need 16mm for the odd special event.
The lamps are very expensive over here, but someone bought about a dozen from the USA at a much lower price a few years ago, and I bought four from him. Two of those went in last year, and have just a few hours on them, and I have the other two as spares, and I only use them for three or four shows a year, but I will either need to find some more Marc 300s, or some alternative one day.
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Ken Layton
Phenomenal Film Handler
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Posts: 1452
From: Olympia, Wash. USA
Registered: Sep 1999
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posted 02-19-2003 03:27 PM
Quick specs on the Marc lamps:
EZG Gemini-300, 35 volts, 8.5 amps, 2-1/4" double D dichroic reflector, 75 hours. Replaces Marc-300/16A
EZM Marc-300/16, 37.5 volts, 8 amps, 3" double D dichroic reflector, 25 hours.
EZS Marc-300/35K, 37.5 volts, 8 amps, bare arc lamp (no reflector), 25 hours.
EZT Marc-350/16T, 45 volts, 7.7 amps, 3" round reflector, 50 hours.
MARC and GEMINI are General Electric trademarks. Colorarc is a Sylvania trademark.
Typical ignition voltage is 4,000 to 5,000 volts which is much lower than what's used to ignite xenon lamps.
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Stephen Furley
Film God
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Posts: 3059
From: Coulsdon, Croydon, England
Registered: May 2002
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posted 02-20-2003 10:34 AM
Ken,
This is getting confusing. It lists the Gemini as being a replacment for the Marc 300/16, yet shows the size as being smaller, as with the Gemini lamp which I have seen, so I don't see how it can replace the 300/16, unless they make some sort of adapter for it, which I have never heard of.
Where did you get this info from, was it direct from GE? If so, I think I may try to contact them, and ask for clarification.
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