Modifying a front projector; feasable? - AVS Forum
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post #1 of 12 Old 07-03-2007, 02:55 PM - Thread Starter
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Hello! This is my first post ever so please be kind. I wanted to talk about the lamp lifespans on these projectors(way to short). I own a Mitsubishi HD1000U, and I'm in love with the dang thing. Perfect for my console games. The thing is, I play so much my bulb is starting to wear. In six months I've accumulated 1795 hours on the bulb and I figure I'll have to replace it by the end of the year, if not sooner. This worries me since the bulbs are particularly expensive compared to the cost of the unit. As a remedy to the short lifespan I'm looking to pump light in from an external source like an L.E.D. array via fiberoptics or build a mirrored enclosure. I've found a few places that will sell 2000 lumen LED arrays @6500k with an estimated 12000hr lifespan. Can anyone here tell me if they have even heard of what I plan to do or if anyone has had any succes doing something similar? I plan to do this by the end of july and will post before/after pics if successful, but it would be nice to hear some advice/caution beforehand. My biggest concern right now is achieveing light uniformity. Thanks in advance.
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post #2 of 12 Old 07-03-2007, 03:52 PM
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Good luck.

I would think - not feasible, but what do I know.
As long as you're prepared to have a paperweight when you're done, go for it. If it works, great. If it doesn't work, you'd likely need to buy a new projector.

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post #3 of 12 Old 07-03-2007, 04:45 PM
 
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What level of heat do LED arrays produce?
I am assuming heat is the biggest factor in bulb life, second to energizing off and on.
There's tale of some tungsten bulbs from the 1930s that have never been turned off and are still lighted today!
I think the efficiencies we've introduced have achieved obselesence. (sp)

A remote light source fed to the projector throught fiber optics is an very interesting idea. Least it would cut out the fan noise.
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post #4 of 12 Old 07-04-2007, 10:02 AM
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Quote:
Originally Posted by MidLife View Post

What level of heat do LED arrays produce?
I am assuming heat is the biggest factor in bulb life, second to energizing off and on.
There's tale of some tungsten bulbs from the 1930s that have never been turned off and are still lighted today!
I think the efficiencies we've introduced have achieved obselesence. (sp)

A remote light source fed to the projector throught fiber optics is an very interesting idea. Least it would cut out the fan noise.



Those hundred year old bulbs are also very dim compared to modern bulbs. I would think anything would be possible. Just because nobody has invented it yet doesn't mean it wont work. Sure you might kill your pj, but you might also become a millionaire in the end! What about halogens? Don't they run much cooler than other bulbs?
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post #5 of 12 Old 07-04-2007, 12:56 PM
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I wish I could contribute technically to this thread, but I can't--sorry!

But I have often wondered why it is we are stuck with this bulb technology in these projectors--and part of me says that if there were other solutions to present bright or brighter bulbs, with less heat and much longer life, then it would have been done already.

And another more cynical part of me believes that the bulbs are money-generators for these companies, with people have to replace the bulbs periodically, therefore companies don't want to remove that revenue source.

Don't know the answer, though. It certainly seems like it should be able to work.

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post #6 of 12 Old 07-05-2007, 01:08 PM - Thread Starter
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I decided to buy a small but powerful flashlight to shine into the projector as a cheap test. Pending the outcome of this experiment I will buy a CFL bulb accordingly. I'm looking at a few rated at 2000 to 2500 lumens with 10,000 hour lifespans but I am unfamiliar with what color temperature to buy. I'm thinking 6500k as that is most like daylight but if anyone has any better suggestions I'm willing to listen to arguements.
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post #7 of 12 Old 07-05-2007, 01:42 PM
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If you are not aware already, the current projectors have an electronic connection to the lamp assemblies which not only feedback lamp life info but if a lamp is there at all. If you remove the lamp assembly to try your led test, the projector will read it as no lamp found and will not turn on.

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post #8 of 12 Old 07-07-2007, 09:32 AM
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Ummm...

I would be shocked if this worked. I am interested to see you try though...

1800 hours in 180 days = 10 hrs/day. Might want to find a PJ with a lower bulb cost next time. Still, if you think its going to last another 1800 hours you might have already found the best bulb in all the land.
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post #9 of 12 Old 07-26-2007, 09:41 PM
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redspectacle, did you ever get your alternate light source to work?
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post #10 of 12 Old 07-27-2007, 08:13 PM
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He electrocuted himself.

"The dream never dies, just the dreamer."

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post #11 of 12 Old 08-25-2007, 12:40 PM
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Here's what I do...
I got a separate savings account at my bank and I direct deposit $15 or $25 per paycheck in there. By the time I need a new bulb I already have the money sitting there and there's no big expense to buy it. I don't miss the little bit of money out of each check, and I'll never suddenly find myself needing to spend $400 on a lamp without having any money.
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post #12 of 12 Old 08-25-2007, 12:45 PM
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Quote:
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He electrocuted himself.


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