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Topic: Best lamp for Elmo GS1200 anno 2017. Also for my Elmo ST1200 and Bauer T610.
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Paul Browning
Phenomenal Film Handler
Posts: 1006
From: West Midlands United Kingdom
Registered: Aug 2011
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posted November 25, 2017 03:04 PM
Graham, these reflectors are used in martin lighting fixtures, and the lamps too, this what inspired my idea behind the discharge lamp. They use bright nickel plated alloy reflectors, that can withstand a 250watt discharge lamp in an enclosed space for a long period of time, but for a bull's eye reflector setup, try the optikinetic solar 250 projector, this has a bulls eye lens and reflector bowl behind to focus the light on an aperture. Matthieu, you can use copper to cut glass with paraffin as a lubricant, but a diamond cutting wheel is just good, with a hobbyist hand grinder, but be careful this is silicate and will shatter without warning, slowly does it....
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Matthieu van der Sluis
Master Film Handler
Posts: 373
From: Barendrecht, The Netherlands
Registered: Aug 2017
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posted November 26, 2017 04:10 PM
The handling is not differend/better on a GS1200 MKIII, compared to a MKII, or MKI?
The MKIII seems to be more refind.
@ Graham. I bought the Donar ESC lamps here:
https://www.replacementlightbulbs.com/lampesc.html
I've never seen a Fuji ESC in my GS1200 projectors, so I don't know, if they're the same in brightness and whiteness and if it is interessting to use this reflectors for a lamp refirbishing, when you cannot get a Fuji ESC.
Are this the kind of HID lamps which must be put in the GS1200 projector?
Than I must dril a lot more from the ESC reflector, or we need an better reflector.
[ November 27, 2017, 08:18 AM: Message edited by: Matthieu van der Sluis ]
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Paul Browning
Phenomenal Film Handler
Posts: 1006
From: West Midlands United Kingdom
Registered: Aug 2011
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posted November 27, 2017 02:45 PM
that will give you nearly as much light as the beaulieu, with a three blade shutter, not sure if you can connect this directly to the output supply on the transformer of the GS, as this is designed for a 12v car supply. There is a 55w version too, and the light output of this xenon lamp is like the GS XENON. The key to this working correctly is the lamp position in the reflector, and fixing it correctly. Now the reason why I chose this is simply because you can obtain the fixture for the lamp from most scrap cars headlamp for pennies, and quickly replace it as these are spring loaded. You will need a ceramic sleeve to get the spacing just right. If the transformer output is dc, all would be good if the it can give enough amps, but for the brightness its incredible for 35watt lamp, that costs less than a tenner sterling to replace. The opti uses a m33 lamp with a reflector and bull eye lens ,you can get these on ebay or you can still get the bits from opti still, but check first might be expensive. I use a cctv power supply which is fine, it has multiple outputs, pwm power supply, didn't get too warm when I tested it, and again I say any projector with this setup could be converted. If you want a reflector modifying just send it to me, I can cut the reflector accurately......
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Paul Browning
Phenomenal Film Handler
Posts: 1006
From: West Midlands United Kingdom
Registered: Aug 2011
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posted November 27, 2017 04:49 PM
Theres still a bit to do Matthieu, I would like to use the GS power supply, but this needs to be dc, and think the output is ac on the tranny, but I have not checked this, I don't think it is rectified. The lamp holder in the gs will be fine because it fits and hold the reflector, its just setting up the lamp position, but I was going to make a little holder for this, just so the glue sets. To get more light you could convert the gs to a two blade shutter, this would increase the light output a fair bit. When I did this test some time back the beaulieu was brighter measured at the screen but not whiter, I think this is 6400 kelvin or 6700 kelvin, can't just remember now, but the overall effect was impressive. This would be plenty bright enough for home cinema use, and you could retro fit this yourself. Graham I have some replica reflectors, GS 1200 XENON, which are the same as the 16mm Elmo XENON. These will be polished to mirror finish and will with me shortly, after sorting some thicker gauge material, but they can also be nickel plated or chrome plated.
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Paul Browning
Phenomenal Film Handler
Posts: 1006
From: West Midlands United Kingdom
Registered: Aug 2011
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posted November 28, 2017 04:48 PM
The xenpower lamp still uses a ESC type lamp reflector, but as graham has pointed out this fails with the standard lamp of 200 watts fitted to it, how long would it be before this reflector coating was peeling off of going brown. This is not for an amateur at home to fit, its needs a douser, an extra fan to cool it, it has to left on and not switched off, you need to get a ballast or it won't work, given that its much brighter than the 35 watt or 55watt car HID, this can all be done for less than the price of the one lamp, and is bright enough for home use, and cheap enough to replace. If your doing large halls or shows for more than a few people, the xenpower is the way to go, this idea is to allow it to fitted to the less high end projectors and allow others to share almost xenon brightness for a lot less money....
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Graham Ritchie
Film God
Posts: 4001
From: New Zealand
Registered: Feb 2006
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posted November 29, 2017 01:32 PM
Hi Paul
I do remember that video but cant find it...its interesting to see on you-tube what people get up to with there film projectors ![[Cool]](cool.gif)
Maurice
I had a look at that lamp, but not convinced that reflector will last. The conversion kit I bought a while ago was only around the $20-30 dollar mark imported from China. With a colour temperature of 6000K and "pure white" plus given a life of 3000hrs its a cheap Xenon light source alternative.
When I look at some Std8 projectors that are now at least 50 years old, and how the mirrors have lasted, like wise with all slide projectors, those mirrors were made to last even with the heat from eg 500watt lamps.
What I have found in the past with the GS1200, is that even with 200/250watt lamps, two bladed shutter, 1.1 lens, it was still not good enough, and to prove that point I sat my little ST180 with its 3 bladed shutter and cheap 1.3 lens next to the GS, and that little 100watt lamp was still giving me a brighter picture than the GS....so the conclusion I came to is, that more watts are not everything. Its how the light is concentrated on that small gate... thats the key
My aim is to provide a cheap but effective light source that is concentrated only on the gate by a quality reflective mirror.
Well that's the idea ![[Smile]](smile.gif)
PS Its great to hear Thomas and Paul comments and bouncing ideas around makes life interesting..
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the relay was 12VDC The transformer out was 12VAC. mmmmm what do I do now, he said this is what you want, a $5 dollar Bridge Rectifier, he drew a discription for me, as to how to connect the 4 terminals up, got home.. BINGO... the relay now works. The one he gave me was a BR106 600V 10A, simply adding that small bridge retifier in the wiring from the transformer, changed the AC to DC.. for only a 5 dollar component...There is the MB354 400V 35A rectifier thats the next one up. 
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