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Science Forum Index » Engineering - Lighting Forum » Lamps for Episkop
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| P.C. |
 Posted: Mon Mar 12, 2007 9:11 am |
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Guest
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Hi.
I followed this group for a while and hope for some advise. I uses and
collect old projectors mainly Episkop but also diaskop type and these
old projectors is often with old fasion glow lamps up to some 1000 w
100v.
Not the most efficient light source and many newer are fitted with
high preasure lamps so, what I look for is links to explain what it
take to run a good high preasure lamp ; I wonder if what I seen
feeding such lamps are a transformator, a coil , and I also wonder if
various bulbs can be feeded by the same .
http://home20.inet.tele.dk/h-3d/Epidiaskop-sm.jpg
This is just one of the projectors I talk about, an Epidiaskop
carrying a 1000w 110v glov lamp , and it is in the area of what I
could get with simular lamps but between 1000 and 4000 watt.
Links, pointers everything greatfull.
P.C. |
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| Victor Roberts |
| Posted: Mon Mar 12, 2007 11:15 am |
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Guest
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On 12 Mar 2007 07:11:11 -0700, "P.C." <per.corell@privat.dk>
wrote:
Quote: Hi.
I followed this group for a while and hope for some advise. I uses and
collect old projectors mainly Episkop but also diaskop type and these
old projectors is often with old fasion glow lamps up to some 1000 w
100v.
Not the most efficient light source and many newer are fitted with
high preasure lamps so, what I look for is links to explain what it
take to run a good high preasure lamp ; I wonder if what I seen
feeding such lamps are a transformator, a coil , and I also wonder if
various bulbs can be feeded by the same .
http://home20.inet.tele.dk/h-3d/Epidiaskop-sm.jpg
This is just one of the projectors I talk about, an Epidiaskop
carrying a 1000w 110v glov lamp , and it is in the area of what I
could get with simular lamps but between 1000 and 4000 watt.
Links, pointers everything greatfull.
P.C.
I am not familiar with this specific projector. However,
high pressure lamps all must be operated from what is known
as a ballast in the US and "control gear" in Europe. This
is the transformer and coil that you have seen. The ballast
or control gear is a current-limited power supply, actually
a current source, that is matched to the characteristics of
the lamp. High pressure lamps must be operated from a
ballast that is designed for that particular lamp and is
usually not compatible with other model lamps.
--
Vic Roberts
http://www.RobertsResearchInc.com
To reply via e-mail:
replace xxx with vdr in the Reply to: address
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| P.C. |
| Posted: Mon Mar 12, 2007 12:33 pm |
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Guest
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Thanks ;
Ofcaurse The unit will not be assembled and mounted by an amature,
this is allready prepared , but it would be nice to install more
modern lamps to a few of my Episkop --- these are opuaque projectors
where you place a drawing, a print a book and like an overhead the
drawing, print or book side are entlarged and projected onto a
screen . These high quality projectors was used before the overhead
projectors that now mainly are being replaced by digital projectors
--- anyway the Episkop projectors offer some qualities I don't find by
digital and is also quite handy with the architectural renderings I do
beside these projectors offer a projecting distance of 20 meters and
more ; so the volume of light is essential and trust me, this is not
to be installed by an amature.
As I mentioned what I am looking for still need to be not to expensive
and best if it can be found at eBay , but any hint to a whole unit,
diagrams or references are most welcome.
P.C. |
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| P.C. |
| Posted: Mon Mar 12, 2007 12:45 pm |
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Guest
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I plan to restore this unit ,with modern bulbs first ;
http://home20.inet.tele.dk/h-3d/sscreen-31.jpg
I allready have two of these projectors and is waiing for the third ,
they are originaly mounted with two 500 W 110 volt glow lamps of the
real old type put together for 220 volt , but what make me rebuild
these old projectors are the design and high quality lenses , thing is
that the old lamps make a lot of heat and the ventilator some noise
and it realy would be nice with silent ventilators and atleast double
the "amount" of light and I am quite sure this can be made in the
casing --- ofcaurse the old parts and bits will be saved , as these
early 50' projectors are allready described as "antikes" .
Just a P.S. to tell what the project are about. |
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| Victor Roberts |
| Posted: Mon Mar 12, 2007 4:47 pm |
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Guest
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On 12 Mar 2007 10:45:42 -0700, "P.C." <per.corell@privat.dk>
wrote:
Quote: I plan to restore this unit ,with modern bulbs first ;
http://home20.inet.tele.dk/h-3d/sscreen-31.jpg
I allready have two of these projectors and is waiing for the third ,
they are originaly mounted with two 500 W 110 volt glow lamps of the
real old type put together for 220 volt , but what make me rebuild
these old projectors are the design and high quality lenses , thing is
that the old lamps make a lot of heat and the ventilator some noise
and it realy would be nice with silent ventilators and atleast double
the "amount" of light and I am quite sure this can be made in the
casing --- ofcaurse the old parts and bits will be saved , as these
early 50' projectors are allready described as "antikes" .
Just a P.S. to tell what the project are about.
The lamp is part of the optical system in a projector. If
you change the size of the lamp I expect that you would have
to change other parts of the optical system to maintain even
light uniformity over the whole image. There is also the
problem that many HID lamps do not have the color quality
necessary for projection applications.
You say the current system uses a 500 watt, 110 volt "glow"
lamp. Can you explain further? To me a glow lamp means a
low pressure gas discharge lamp, but I have never seen a
500-watt low pressure gas discharge lamp. Can you describe
the lamp and show us a picture of it?
--
Vic Roberts
http://www.RobertsResearchInc.com
To reply via e-mail:
replace xxx with vdr in the Reply to: address
or use e-mail address listed at the Web site.
This information is provided for educational purposes only.
It may not be used in any publication or posted on any Web
site without written permission. |
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| P.C. |
| Posted: Mon Mar 12, 2007 6:09 pm |
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Guest
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Quote:
The lamp is part of the optical system in a projector. If
you change the size of the lamp I expect that you would have
to change other parts of the optical system to maintain even
light uniformity over the whole image. There is also the
problem that many HID lamps do not have the color quality
necessary for projection applications.
Exactly , but with episkop there are no condensor ,the light is
reflected by mirrors and it is the reflected light that is first
directed by a sufrace mirror towerds the projecting optic , no other
optic than in a camera the lens the "system" are the exact same except
from a single plane surface mirror in fact an Episkop can make very
nice pictures if you place a huge fotographic film , --- but you are
right that with the diaskop you see in my first picture, the lamp
cirtainly are a part of the optic system . I get the Episkop part
working perfect with the cheapest halogen lamp , but svitching to the
diaskop part show clearly that the light source have to cover a
particular arear in a particular place; -- the long spiral in a cheap
halogen lamp simply don't work for the diaskop nomatter how huge the
condenserm and how huge a reflector as in this projector .
-------- But let me stop waste my time here.
Quote:
You say the current system uses a 500 watt, 110 volt "glow"
lamp. Can you explain further? To me a glow lamp means a
low pressure gas discharge lamp, but I have never seen a
500-watt low pressure gas discharge lamp. Can you describe
the lamp and show us a picture of it?
--
Vic Robertshttp://www.RobertsResearchInc.com
To reply via e-mail:
replace xxx with vdr in the Reply to: address
or use e-mail address listed at the Web site.
This information is provided for educational purposes only.
It may not be used in any publication or posted on any Web
site without written permission. |
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| Ioannis |
| Posted: Mon Mar 12, 2007 6:31 pm |
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Guest
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"Victor Roberts" <xxx@lighting-research.com> wrote in message
news:3bibv2t0n4sbdgnugicng65kcslnkemgfp@4ax.com...
[snip]
Quote: You say the current system uses a 500 watt, 110 volt "glow"
lamp. Can you explain further? To me a glow lamp means a
low pressure gas discharge lamp, but I have never seen a
500-watt low pressure gas discharge lamp.
Such a lamp would make one heck of a night-light: 500W "glow" Neon lamp, for
example. It would also make a good "electronics indicator" lamp, except that
it may consume more power than the entire appliance it is attached to. I want
one for my bedroom, asap! :-)
Quote: Can you describe
the lamp and show us a picture of it?
I think he probably means a 500W incandescent, at least judging from the
Wattage. I have seen episcopes with a 1,000W/BD metal-halide when I was in the
States, but the scope he shows on the photo seems quite old to use metal
halide technology. I may be wrong though...
I.N. Galidakis
http://ioannis.virtualcomposer2000.com/ |
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