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Dirk Bruere at Neopax
Guest
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 Posted:
Mon Oct 17, 2005 11:12 pm Post subject:
IMAX question |
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Anyone know the lumen output of the projector? I know the o/p of the light
source, 15kW 600k lumens, but not the machine itself.
--
Dirk
The Consensus:-
The political party for the new millenium
http://www.theconsensus.org
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Dave Martindale
Guest
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| Posted:
Tue Oct 18, 2005 10:33 pm Post subject:
Re: IMAX question |
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Dirk Bruere at Neopax <dirk.bruere@gmail.com> writes:
| Quote: | Anyone know the lumen output of the projector? I know the o/p of the light
source, 15kW 600k lumens, but not the machine itself.
|
Under what conditions? During projection, the light output depends on
the content of the film, since the film absorbs most of the light
reaching the film plane.
The open-gate light output would be much higher, but you can't actually
run an IMAX projector open gate for more than a few seconds without
risking cracking the projection lens (thermal effects).
Also, what are you comparing to? The screen image in an IMAX theatre is
going to be pretty dim compared to a home theatre, but the IMAX theatre
is completely dark while the home theatre generally is not.
Dave |
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Dirk Bruere at Neopax
Guest
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| Posted:
Sat Oct 22, 2005 9:43 pm Post subject:
Re: IMAX question |
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Dave Martindale wrote:
| Quote: | Dirk Bruere at Neopax <dirk.bruere@gmail.com> writes:
Anyone know the lumen output of the projector? I know the o/p of the light
source, 15kW 600k lumens, but not the machine itself.
Under what conditions? During projection, the light output depends on
the content of the film, since the film absorbs most of the light
reaching the film plane.
The open-gate light output would be much higher, but you can't actually
run an IMAX projector open gate for more than a few seconds without
risking cracking the projection lens (thermal effects).
Also, what are you comparing to? The screen image in an IMAX theatre is
going to be pretty dim compared to a home theatre, but the IMAX theatre
is completely dark while the home theatre generally is not.
|
I'm comparing it to home digital video projectors that say things like "2000
lumens" on the box. So I assume that's open gate.
So far I have had to make an educated guess that approx 20% of the bulb's light
gets to the screen (in both cases).
--
Dirk
The Consensus:-
The political party for the new millenium
http://www.theconsensus.org |
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Jeffry L. Johnson
Guest
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| Posted:
Mon Oct 24, 2005 3:41 am Post subject:
Re: IMAX question |
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Dirk Bruere at Neopax <dirk.bruere@gmail.com> wrote:
| Quote: | Dave Martindale wrote:
Dirk Bruere at Neopax <dirk.bruere@gmail.com> writes:
Anyone know the lumen output of the projector? I know the o/p of the light
source, 15kW 600k lumens, but not the machine itself.
Under what conditions? During projection, the light output depends on
the content of the film, since the film absorbs most of the light
reaching the film plane.
The open-gate light output would be much higher, but you can't actually
run an IMAX projector open gate for more than a few seconds without
risking cracking the projection lens (thermal effects).
Also, what are you comparing to? The screen image in an IMAX theatre is
going to be pretty dim compared to a home theatre, but the IMAX theatre
is completely dark while the home theatre generally is not.
I'm comparing it to home digital video projectors that say things like "2000
lumens" on the box. So I assume that's open gate.
So far I have had to make an educated guess that approx 20% of the bulb's
light
gets to the screen (in both cases).
|
The proper measurement is the reflected light from the screen, measured
in foot-lamberts. The standard for motion picture film projectors is 16
foot-lamberts (open gate, or no film). I believe video should be 12
foot-lamberts. |
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