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This topic comprises 2 pages: 1 2
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Author
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Topic: 2000ZX light output
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David Stone
Film Handler
Posts: 75
From: Hornsby, Sydney, Australia
Registered: Jun 2008
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posted 03-10-2011 08:23 PM
Hi Brad & Dave,
Thank you for the advice.
The 10% fall off in light I refered to was not the xenon, but the light engine itself. The techs downunder say you should expect this to degrade @ 10% per year as well as the natural fall off the bulb ?
I use a CDXL30 bulb, REALD Z screen, 1500watts 2D W/S, 1700watts 2D C/S, 2500watts 3D W/S, and 3000watts 3D C/S.
65' throw, 32' scope picture.
Do these settings sound usual, or maybe there is an alignment problem.
I did use a CDXL30SD, but it would drop out regularly as 2D W/S would run only 1100 watts Cheers,
David.
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Steve Guttag
We forgot the crackers Gromit!!!
![](http://www.film-tech.com/ubbmembers/268e.gif)
Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 03-11-2011 05:31 PM
The Iris you speak of would likely be back in the lamphouse area, not in the lens...in the lens would jack the price of each lens way up. With an IRIS you are driving the lamp okay at all times but you are always driving it high.
With an anamorphic, you lower the lamp demands for ALL formats...in that Scope's light requirements are much closer to Flat's. With an iris, you are lamping for your worst format (scope) and throwing that light, electricity, lamp costs, away. With an anamorphic, you just use a smaller lamp or use less electricity at all times.
And for 2D/3D...change the lamp. If you have a Barco, then you have lamphouses...the lamphouse has a board on it that stores the lamp info...as such, as one swaps between the 2D and 3D lamp, the hours and operating range...etc are kept up. Since it is pin registered it need not be aligned one a simple 2D/3D swap...only when a new physical lamp is replaced.
As for lumen output decay within the projector over time...I don't think anyone has really published what that is. One would also have to attribute the source of the decay. That is, is it the reflector of the lamphouse, section, the light pipe, folding mirrors, imagers, prism...etc. Then compare those loses to those of the port glass or the screen itself (and color correcting for its aging). It will be real hard to pinpoint that the projector is losing say 10% of its light just due to aging...there are too many factors...including the environment that the projector is running in.
-Steve
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