8mm Forum: Another topic about light output

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Topic: Another topic about light output

Knut Nordahl
Expert Film Handler

Posts: 173
From: Norway
Registered: Dec 2005

posted January 16, 2008 09:55 AM

I know increased lighting from projectors have been discussed before, but I still have some questions.

Would you say you gain more in light output in going from a 100 to a 150 watt projector or going from a 1.3 to a 1.1 lens on a 100 watt projector?

I came across this little dohickey http://www.elfa.se/elfa-bin/setpage.pl?http://www.elfa.se/elfa-bin/dyndok.pl?lang=no&vat=0&dok=10490.htm
wich seems to boost your voltage. Would that possibly work to provide 15 volt to a 150 watt bulb in a 100 watt projector?

I ordered one and will see what it is about anyway.

Regards.

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Kevin Faulkner
Film God

Posts: 4071
From: Essex UK
Registered: Jun 2003

posted January 16, 2008 10:54 AM

That device will not work as you need a device capable of supplying 10amp. That device is only capable of 2.5 amps.
I dont really know the answer to the rest of your question but suspect that the lens change will give the most change in light output.
Better still would be the change of a 3 blade shutter to a 2 blade as this will give nearly a third more light output. 18FPS does look more flickery though.

Kev.

--------------------
GS1200 Xenon with Elmo 1.0...great combo along with a 16-CL Xenon for that super bright white light.

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Knut Nordahl
Expert Film Handler

Posts: 173
From: Norway
Registered: Dec 2005

posted January 18, 2008 01:22 AM

Crap, thought I had something there.

It is interresting that you think that the effect of increased light output will be greater by switching lens or shutter. than going from 100 to 150. I always thought I should seek a 150 watt projector out, but have NEVER seen one for sale in Norway in the last 3 years or so. I guess there are not many of them here. I'll have to cope with my GS800 and try to get a better lens, and maybe, someday, a two blade shutter conversion.

Thanks for your input.

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Kevin Faulkner
Film God

Posts: 4071
From: Essex UK
Registered: Jun 2003

posted January 18, 2008 04:23 AM

The GS800 is fairly straight forward to replace the shutter so I would go for that option start with along with a 1.1 lens.

The trouble with changing the lamp is that you would have to have a seperate external transformer (cumbersome) and also make sure that any extra heat generated is not going to be detrimental to the machine or the film.

Kev.

--------------------
GS1200 Xenon with Elmo 1.0...great combo along with a 16-CL Xenon for that super bright white light.

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Maurice Leakey
Film God

Posts: 5895
From: Bristol. United Kingdom
Registered: Oct 2007

posted January 18, 2008 05:06 AM

Knut

I have an Elmo GS800 fitted with an f1.1 lens and the result is fantastic. Try and upgrade your lens.

Maurice

--------------------
Maurice

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Lee Mannering
Film God

Posts: 3216
From: The Projection Box
Registered: Nov 2006

posted January 18, 2008 07:15 AM

As the leading authority on GS800 (cough, cough) if it was me I would leave it in the original condition especially as they are my favourite machine. For many years now the 800 has been a favourite here and if I had any advice I would propose installing the f1:1 lens and stick to Osram lamps changing every 25 yours or so to squeeze the maximum out of them. Osram say the lamps last 50 hours but to get the peak I recon they fall away after 25. Locally we buy them for £7.99 so it’s not the end of the world to change regularly and use them later on for film checking.

The GS800 is a very fine machine, no mucking about with heavy maintenance as in the 1200 machine and all those blasted motors but I would think twice before I started messing with a fine machine. I looked at changing the shutter in one of my GS800’s some time ago and resisted the temptation then purchased an ice cream tray for the intervals to further enhance the shows instead. My Wife likes that job!

Over the years I’ve had many 800’s and they have all been very nice, and its only recently I parted with my last little used spare machine due to a thin down in gear making way for films. This one had the f1:1 lens fitted and it made a huge difference from the nasty f1:3 it came with so worth looking out for that.

Good luck with the GS800 my friend.

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Knut Nordahl
Expert Film Handler

Posts: 173
From: Norway
Registered: Dec 2005

posted January 18, 2008 08:09 AM

I do enjoy the 800 and i suspect it is one of the later ones, so I'll probably ejoy it for some years.
If I can find a 1.1 lens (or 1.0) i'll snap it up.

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Lee Mannering
Film God

Posts: 3216
From: The Projection Box
Registered: Nov 2006

posted January 18, 2008 08:27 AM

Knut
Focus will be tight with the f1.0. Look for the f1.1 a much better bet or you may find yourself holding the focus knob all the time if you are projecting older films possibly a bit warped.
Best
Lee.

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