Re: Help with projector problem
From: WDino (nogood_at_bigpond.com)
Date: 08/17/04
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Date: Tue, 17 Aug 2004 02:27:23 GMT
Have a look at the price for similar street lamps. I have bought them
for less than $50 for HIDs. Ok, they are different:
- operate via 60 Hz ballasts instead of the DC ballasts in projectors,
- have both electrodes the same size (projector bulbs have one much
larger than the other as they are DC),
- have a much wider gap (projectors need almost point source for even
coverage),
- are not concerned with exact color temperature,
- are contained inside a large glass envelope and not precision
mounted as are projector lamps,
- last 8000 hours upwards!!! (i have one that is still going with good
light output after 8900 hours - in a projector)
jakdedert wrote:
> James Sweet wrote:
>
>>>Somebody's gonna make a projector with a $100/2000 hour/2000 lumen
>>>replacement bulb and sweep the market...maybe actually use an
>>>existing type lamp (maybe one of the numerous, multiple sourced,
>>>stage lighting types?) instead of designing one which will only fit
>>>that model. At that point, LCD projectors will become economical
>>>for home viewing.
>>>
>>>jak
>>>
>>>
>>
>>Don't hold your breath. Yeah there's some gouging going on, but the
>>lamps are expensive because they're precision made, taking into
>>account brightness, color temperature, color rendering index,
>>uniformity, warmup time, etc, there's a lot more to it than just
>>producing a bright light. The best hope is that the technology will
>>stabilize and lamps will become standard across at least projectors
>>of the same class.
>
>
> Believe me, I'm not gonna be holding my breath. Yes, they are precision
> made, but how many parts #'s are out there? I've only seen a few of the
> replacement lamps, so I don't know; but would there be any possibility of
> producing an adaptor of some sort which would allow at least some
> commonality among various brands? As to color temperature, the stage
> lighting types are pretty closely matched as well, but could that not be
> compensated for in the projector settings? Maybe not close enough for
> critical video viewing, but most of these get used to project computer
> images, IME (PowerPoint presentations). Absolute color accuracy is not an
> issue there. In fact very few projectors--placed side by side--look the
> same in this respect, anyway.
>
> I believe, having used these things in the A/V Presentations industry since
> they were introduced (and operating CRT projectors for years before that),
> that we're reaching a critical mass. The new machines are getting lighter
> and smaller. New models are constantly being introduced, but are still
> expensive...with a prohibitively high maintenance issue down the line. With
> millions of older units out there, I believe that if someone could introduce
> a cheaper alternative (I think half list price would be ideal, but even a
> 25% reduction might do it.) for replacement lamps, that the world would beat
> a path....
>
> jak
>
>
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