Re: Do you use a UPS with your projector / HT system?
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Joined: Jul 2004
Posts: 4,444 Likes: 16
connoisseur
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connoisseur
Joined: Jul 2004
Posts: 4,444 Likes: 16 |
Id, there's no real benefit to be gained from a UPS for the situation that you describe. This has been discussed here and elsewhere in the past and it's been pointed out that if the power goes off and stops the fan, the bulb doesn't get hotter, since it shuts off too. Without the fan running it simply takes longer to cool down, but this isn't significant. Not true John. When the bulb is lit, the fan is running to keep it cool. The fan is needed and whomever was in the discussion before that came to the conclusion you reference above was also wrong.
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Re: Do you use a UPS with your projector / HT system?
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Joined: Oct 2005
Posts: 853
aficionado
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aficionado
Joined: Oct 2005
Posts: 853 |
Mdrew is right. Its a sure fire way to not only shorten life of an expensive lamp, but possibly damage internal components in the projector from overheating. Spikes from power outages are another problem though thats solved with a surge suppressor.
John
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Re: Do you use a UPS with your projector / HT system?
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Joined: Mar 2008
Posts: 31
enthusiast
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OP
enthusiast
Joined: Mar 2008
Posts: 31 |
Hi all: Thanks for the great discussion. I suppose I could get a small UPS (which would have some surge protection) for the projector, and then a standard surge protector for the rest. Alternatively I could just plug everything into a simple power strip and use the savings to buy better cables - that's bound to help enhance my A/V experience....
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Re: Do you use a UPS with your projector / HT system?
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Joined: May 2003
Posts: 18,044
shareholder in the making
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shareholder in the making
Joined: May 2003
Posts: 18,044 |
Yeah, I gotta agree with Mike and John here, John. If projector lamps didn't need to be actively cooled when turned off, projectors wouldn't run the fans for 5 minutes when powered down.
EDIT: Here's my totally made up hypothesis: while the projector is on, the bulb is clearly hot. The fan keeps the glass of the bulb cool, but obviously can't do anything (nor should it) to keep the filament (or whatever the actual light source is) cool. When the power cuts out, the fan stops, as does the light. However, the glass can heat up because the filament (or light producing element) will still be radiating heat. If the glass heats up too much, well then...
Last edited by kcarlile; 04/15/08 03:47 PM.
I am the Doctor, and THIS... is my SPOON!
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Re: Do you use a UPS with your projector / HT system?
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Joined: Dec 2003
Posts: 10,420
shareholder in the making
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shareholder in the making
Joined: Dec 2003
Posts: 10,420 |
If the glass heats up too much, well then... Then what? The suspense is killing me!
Jason M80 v2 VP160 v3 QS8 v2 PB13 Ultra Denon 3808 Samsung 85" Q70
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Re: Do you use a UPS with your projector / HT system?
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Joined: May 2003
Posts: 18,044
shareholder in the making
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shareholder in the making
Joined: May 2003
Posts: 18,044 |
I am the Doctor, and THIS... is my SPOON!
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Re: Do you use a UPS with your projector / HT system?
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Joined: Jun 2003
Posts: 8,488 Likes: 1
axiomite
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axiomite
Joined: Jun 2003
Posts: 8,488 Likes: 1 |
But, where's the earth-shattering 'Ka-Boom'?
bibere usque ad hilaritatem
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Re: Do you use a UPS with your projector / HT system?
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Joined: Dec 2003
Posts: 10,420
shareholder in the making
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shareholder in the making
Joined: Dec 2003
Posts: 10,420 |
That happens when pay for the new bulb.
Jason M80 v2 VP160 v3 QS8 v2 PB13 Ultra Denon 3808 Samsung 85" Q70
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Re: Do you use a UPS with your projector / HT system?
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Joined: Apr 2003
Posts: 16,441
shareholder in the making
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shareholder in the making
Joined: Apr 2003
Posts: 16,441 |
I don't like your theory, Ken.
When the PJ is powered, the fan removes excess ambient heat from the bulb enclosure, but I doubt it actually lowers the temperature of the bulb glass directly. Sure, if the bulb were on without the fan, then the hot air build-up in the confined space would contribute to a hotter bulb and might actually melt the enclosure.
I think a point we can all agree on is that the less heat a bulb experiences, the longer it will last -- more heat means more entropy means more rapid decay of the filament.
JohnK, sure, when the power cuts out, the heat of the entire system will begin to diminish; however, because it's the total heat over time that determines the longevity of a bulb (absent other forces such as vibration shock), active cooling of a recently extinguished bulb will contribute cumulatively to its longevity.
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Re: Do you use a UPS with your projector / HT system?
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Joined: May 2003
Posts: 18,044
shareholder in the making
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shareholder in the making
Joined: May 2003
Posts: 18,044 |
Yeah, that makes sense too.
I am the Doctor, and THIS... is my SPOON!
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