8mm Forum: GS1200 LIGHTING

»	8mm Forum » 8mm Forum » GS1200 LIGHTING

UBBFriend: Email this page to someone!

Author

Topic: GS1200 LIGHTING

Paul Adsett
Film God

Posts: 5003
From: USA
Registered: Jun 2003

posted January 06, 2006 02:55 PM

Could somebody on the forum please write a technical section on the differences between the various lighting options available on the GS1200, namely ESC Halogen Bulb, Xenon, and HTI (as in John Clancy's GS1200 conversion). What are the relative brightness levels, color temperatures, wattages, and cost? I think this would be of great interest to a lot of us GS1200 owners.

--------------------
The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection,
Elmo GS1200 f1.0 2-blade
Eumig S938 Stereo f1.0 Ektar
Panasonic PT-AE4000U digital pj

| IP: Logged

John Clancy
Phenomenal Film Handler

Posts: 1954
From: Cornwall
Registered: Jun 2003

posted January 07, 2006 05:26 AM

A couple of issues back in 'Super 8 Film Review' (incorporated in Derann's 'Film for the Collector' for those who don't know) we did a feature on the different brightness levels obtained from GS-1200's. I suppose the only obvious exceptions to the results Keith Wilton published were the HTI lamp and the recent Eiko ESC. The Eiko ESC appears to be a rebadged EJL so the illumination is equivalent to an average EJL. The HTI is brighter than anything else ever put in a GS-1200. Probably appears about half as bright again to the average Xenon machine. However, all xenon lights produce a different appearance to film (colour temperature I suppose) and the best results from the HTI are when using a very large screen as we do at the BFCC or when showing a slightly duff print. For example, mediocre prints like the 600ft of Capricorn One could pass as a good print on the HTI as does the 2x400ft 'Scope 'Raise the Titanic'. Other excellent Super 8 prints sometimes do not look as good as on the standard xenon on a home sized screen which I think is due to the colour temperature of the lamp. But on a big screen the HTI comes into its own and I imagine everything will look better due to the increased light output.

I think the esteemed Mr. Faulkner did a post on the subject of differing light outputs from the various lamps about six months ago. Is that the case Kevin or am I talking out my backside?

--------------------
British Film Collectors Convention home page www.bfcc.biz. The site is for the whole of the film collecting hobby and not just the BFCC.

| IP: Logged

Michael De Angelis
Phenomenal Film Handler

Posts: 1261
From: USA
Registered: Jul 2003

posted January 11, 2006 11:08 PM

John,

In regard to lamps for the GS1200, I stopped using the 24v. 250 watt lamps.
Primarily due to the huge spillage of light that bled through the top of the vents in the lamp housing cover. It seemed that I was getting more light on the ceiling and it was distracting from the screen presentation.

Does the HTI pour light out of the top to the vents as well?

Is the HTI something to consider when projecting without a film booth, and with smaller screens?

Michael

--------------------
Isn't it great that we can all communicate about this great
hobby that we love!

| IP: Logged

John Clancy
Phenomenal Film Handler

Posts: 1954
From: Cornwall
Registered: Jun 2003

posted January 12, 2006 02:20 AM

No one should ever use the 250w lamp in a GS Michael so it's just as well you found a reason to stop using it.

I find light comes out the top to a certain extent with all my GS'1200's regardless of the lamp being used in them. I deflect the light with black card a few inches over the top of the vent. The HTI is so bright you'll find the room is in general lit up more than usual anyway so it's not really an issue. I don't suppose I'd recommend the HTI conversion to anyone unless they were real enthusiasts and wanted the very best out of their Super 8 prints.

--------------------
British Film Collectors Convention home page www.bfcc.biz. The site is for the whole of the film collecting hobby and not just the BFCC.

| IP: Logged

Kevin Faulkner
Film God

Posts: 4071
From: Essex UK
Registered: Jun 2003

posted January 12, 2006 05:43 AM

Yes John, We did cover that issue of Lamp types on here at some point. I will see if I can find it.

On the Elmo Xenon, Elmo have placed an extra plastic baffle over the top of the lamp cover. This does actually stop the light from spilling out the top of the machine but does not impede the air flow.

Kev.

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

| IP: Logged

Michael De Angelis
Phenomenal Film Handler

Posts: 1261
From: USA
Registered: Jul 2003

posted January 12, 2006 06:47 PM

Hi again, and thanks to Paul for beginning this thread,

John, I'm curious if you are you using the HTI conversion with a 2 or 3 blade shutter? Because I am thinking of converting to a 2 blade, but wish not to lose the 3 blade for the silents that I run.

Has there been any feed back regarding the switchable shutter blade units that Wittner employs in their conversions? [Confused]

Kev, thank you for the wonderful close up and circled detail of your Xenon model. It was great that you are able to share that pict. I never realized the extra steps Elmo made in creating the Xenon models.

Michael

--------------------
Isn't it great that we can all communicate about this great
hobby that we love!

| IP: Logged

Paul Adsett
Film God

Posts: 5003
From: USA
Registered: Jun 2003

posted January 12, 2006 10:50 PM

I wonder if these plastic light baffles are still available. I would like to put one on my standard GS, because the light spill from the top of the lamp house really lights the room up and reduces picture contrast.

--------------------
The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection,
Elmo GS1200 f1.0 2-blade
Eumig S938 Stereo f1.0 Ektar
Panasonic PT-AE4000U digital pj

| IP: Logged

Kevin Faulkner
Film God

Posts: 4071
From: Essex UK
Registered: Jun 2003

posted January 13, 2006 03:52 AM

Michael, John runs his with the 3 blade shutter. The level of light he is getting would make it dngeraous to film if he installed the 2 blade shutter. He is getting nearly half as much light again with his three baled shutter comparred to my Xenon with the 2 blade shutter.
Paul, I wouldnt mind betting that those plastic baffles would be hard to get. I will look up the part number for you tonight and then you can see if your local Elmo distributor can get you one. They do work well.

Kev.

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

| IP: Logged

All times are Central

Printer-friendly view of this topic

UBB.classic^TM 6.3.1.2