GS1200..250Watt lamp

[Graham Ritchie]

Finished working on it today, but that's it until after Christmas as I hope to run some Super 8 films with the present lamp set up, I will try it out later on the GS1200. It will be interesting to see how it works out. The lamp alignment to the mirror will be carried out with the projector running and cooling. Its just a matter of sliding the lamp either fwd or back through the mirror, to get a even and bright light from the EHJ 24V 250W lamp.

[Brian Fretwell]

Good work there. I remember reading of how Keith Wilton had to modify the reflector in his Chinese 35mm projector to take a different type of Xenon lamp and the trouble he had getting the position right after. A long, tough job but well worth it in the end.

[Graham Ritchie]

Hi Thomas

I had been working on a similar project, thanks to your idea mentioned a while ago. The hardest thing was making the hole without damaging the reflective part of the mirror. Even though I used masking tape to protect it, I had to be really careful.

Its a on going project at the moment, I am on two minds, one to use the 24v 250watt or the 24v 300watt lamps which I have a few of. The hole is big enough, to allow either lamp to slide forward or back through the mirror as I adjust the focus with the projector running in Scope. The bracket will still be 10mm back, as you suggested a while back. It will be interesting to see how much more light, well hopefully, the fact of being able to focus the light better on the gate.

All those parts shown here are spares than I am working with.

Just getting the hole right using a old faulty lamp.

[Thomas Knappstein]

Hello to all!
The new produced OSRAM 250W ELC Cold Mirror Halogen Lamps I had bought had a very dull Light output and a short Lifetime. The Quality is not the same as they had back in the 90´s. And this Lamps are focused for the 16mm Image and not for the Super8 Image. The Lightbeam ist to large for this little Frame. So I have done it another Way. Cut of a Philips Mirror from a 250W ELC Lamp and stuck in the OSRAM Two base Pin Lamp 24V 250W. So now I can focus the Filament forwards and backwards in the Mirror to concentrate the optimal Light Beam onto the small Super 8 Frame. For the Power Source I´m using a 400W 25V external Transformer. I drive this Lamps with 25,2 V and get a Lifetime of 45h. The Lightoutput is amazing and the Prize for one Lamp is only 1,15 Euro.

[Paul Adsett]

Having trouble finding a source for a 24v 250 watt power transformer to run the ELC lamp. I found this one which supplies DC for LED lighting. Would this work?
https://www.ledwholesalers.com/v2/in...product_id=190

[Graham Ritchie]

Just another thought if you don't want to pull some old slide projector apart, then this type of sealed external unit transformer might be the thing. I bought this one new many moons ago for the Ernemann 2, to supply a 24v 300watt lamp. In time I replaced it, with a now, 36v 400watt power supply for the Ernie.

You can buy such sealed transformers such as this from certain electrical suppliers. This one unit alone is rated for 24v 350watt output, so there is more than enough for a 24v 250watt lamp. These sealed units are fused for safety.

[Brian Fretwell]

The reflector looks similar to the type used for GU10 12v 50W long life lamps for display lighting.

[Dominique De Bast]

Thanks you, Maurice. This is, indeed the same bulb than the one I have. I didn't know the littledlittle circles on the reflector were called rings. The only way to know if the bulb is suitable for a projector will be to try it, which I will do next time the lamp of my Fumeo burns.

[Maurice Leakey]

Dominique
I might be an alternative, but have a look at the attached link.
The lamp reflector appears to have rings which might not give a good light for film projector. It's only a thought.
And. It's very expensive compared with the proper EJL lamps.

https://www.cef.co.uk/catalogue/prod...projector-lamp


Maurice

[Dominique De Bast]

Does anyone know if EWF is an American reference for EJL ? I have one 24 v 200 watt bulb Quartzline with those three letters.

[Joe Taffis]

I was very disappointed with the DONAR brand ESC lamp; not thrilled with the OSRAM EJL either

[Dominique De Bast]

FFR in Germany makes the transformation to use 250 watts bulbs but you have to send your projector to them, which is probably something most of collectors will be reluctant to do. http://ffr-film.de/eng-elmo-.html

[Lee Mannering]

For what it's worth. I made the great mistake to stock said lamps for my business. I've had over 10 returned blown within minutes to date and from my experience they are of questionable quality. The rest of the stock hit the bin quickly as well. In every one returned they all coloured black and with broken filaments, that is more than ten customers with GS 1200 machines.
The proof of the pudding is in the using..

Using the 250 watt lamp is a easy alternative particularly with a external power driver which Graham has come up with. Might be worth moving the lamp bracket a few mm to see if the correct focusing can be achieved.

When I started using the High Intensity Discharge lamps I was astounded at the increase in light output by moving the lamp just 2mm.

We just never stop learning with this hobby of ours.

[Chip Gelmini]

This vendor is in the USA. I believe the brand is Donar. But it IS the original ESC ansi code. I have purchased this. No trouble with the image or lamp life. My throw distance is just under 20 feet.

Don't forget Steve Osborne as well. A recent flyer listed as bulbs are in stock.

https://www.replacementlightbulbs.com/lampesc.html

[Graham Ritchie]

Simon

For many years the proper ELC was not available to buy, hence the only option was a 200 watt EJL. It was not a question of more wattage, it was just finding a lamp you could buy to work. When Fuji did release a ESC lamp a few years back, I did go in to speak with a local lamp specialist, who over the years have got me all kinds of lamp stuff, and value there advice. The impression I got, was that they could get the Fuji lamps, but said they were expensive with a downside of only a life rating of 25 hours those two things alone put me of getting it.

I remember setting up a side by side screen comparison between my 100watt ST180 and the GS with the 200watt EJL. I found the little ST180 was giving me a brighter white picture than the high setting on the GS, so it never a question of more wattage.

Using the EJL 200watt over the years was a real letdown with the GS1200, even in the very early days I remember a friend getting rid of a GS1200 because the ESC lamps were not lasting and costing him a small fortune. Reflecting back, to get the brightness you need from the ESC did come at a cost of lamp life.

The Osram Xenophot lamps do give you more of a white light, than the standard lamp, which I find gives better colour reproduction on the screen.

Each to there own on this one, but I must say I have a strong dislike for the EJL lamp and wont use it