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Slide projector - discharge lamp light source?

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N_Cook

Jan 1, 1970
0
Anyone aware of a make / model that used mercury or other discharge lamp
light source for conventional ie 35mm photographic format slides, not
scpecialised large format systems
 
W

William Sommerwerck

Jan 1, 1970
0
I'm a bit lost, here.

Discharge lamps are not continuous-spectrum sources, and would probably not
work very well when projecting color images. And with mercury, you'd have to
filter out the UV, not to mention the ozone generated by the UV.
 
N

N_Cook

Jan 1, 1970
0
William Sommerwerck said:
I'm a bit lost, here.

Discharge lamps are not continuous-spectrum sources, and would probably not
work very well when projecting color images. And with mercury, you'd have to
filter out the UV, not to mention the ozone generated by the UV.


So am I, video projectors and back projected TVs seem to manage fine.
 
M

Meat Plow

Jan 1, 1970
0
Anyone aware of a make / model that used mercury or other discharge lamp
light source for conventional ie 35mm photographic format slides, not
scpecialised large format systems

Do you need one or are you just thinking out loud? Are 35mm slides still
popular? If you're not seeing them maybe the technology isn't calling for
discharge illumination.
 
N

N_Cook

Jan 1, 1970
0
Meat Plow said:
Do you need one or are you just thinking out loud? Are 35mm slides still
popular? If you're not seeing them maybe the technology isn't calling for
discharge illumination.


Just curious. Just repaired a Kodak carousel projector with 300W bulb and
wondered what the power requirement for a lumen for lumen equivalent
discharge lamp would be , or is it just smps gives the edge.
But then is there a problem with smps supplying a filament lamp, in the way
of thermal runaway
 
M

Meat Plow

Jan 1, 1970
0
Just curious. Just repaired a Kodak carousel projector with 300W bulb
and wondered what the power requirement for a lumen for lumen equivalent
discharge lamp would be , or is it just smps gives the edge. But then is
there a problem with smps supplying a filament lamp, in the way of
thermal runaway

I think the technology is stagnant. Same goes for home movies on film.

There isn't sufficient need to improve the design.
 
W

William Sommerwerck

Jan 1, 1970
0
Just curious. Just repaired a Kodak carousel projector with
I think the technology is stagnant. Same goes for home movies
on film. There isn't sufficient need to improve the design.

Agreed. Slide projectors never got past tungsten-halogen lighting.

Discharge lamps would no doubt be more efficient. But... not only would you
have to correct for color balance, but the bulb would have to be "mated" to
the projector's optical system.
 
M

Meat Plow

Jan 1, 1970
0
Agreed. Slide projectors never got past tungsten-halogen lighting.

Discharge lamps would no doubt be more efficient. But... not only would
you have to correct for color balance, but the bulb would have to be
"mated" to the projector's optical system.

Large theater projectors are still an arc light ? There must be some
sort of white/color balancing scheme for them. Same could be used on
other forms of HID illumination.
 
W

William Sommerwerck

Jan 1, 1970
0
Discharge lamps would no doubt be more efficient. But...
Large theater projectors are still an arc light?

I'm not sure. I seem to recall that some use some form of tungsten lighting.
Don't hold me to it.

There must be some sort of white/color balancing scheme for
them. Same could be used on other forms of HID illumination.

The "scheme" is simply to have a standardized color temperature. The prints
can then be balanced accordingly.
 
D

Dave Plowman (News)

Jan 1, 1970
0
Discharge lamps are not continuous-spectrum sources, and would probably
not work very well when projecting color images. And with mercury, you'd
have to filter out the UV, not to mention the ozone generated by the UV.

They're used for lighting on film and TV so can be pretty good. As well as
for DLP etc projectors.
 
T

tm

Jan 1, 1970
0
Arfa Daily said:
I seem to recall that modern cinema projector lamp houses make use of
short-arc xenon discharge lamps, but as you said, don't hold me to it ...

Arfa

Speaking of HID lights, does anyone know where I can get a schematic for a
Philips EUC 120 C/00 Lampdriver?



Thanks,
tm
 
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