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#322912 - 09/16/10 05:06 PM Re: Projector bulb - need a new one! [Re: medic8r]
Worfzara Offline
aficionado

Registered: 07/25/05
Posts: 709
Loc: London area, Ont, Canada
I don't know if your going to be sucessful at re writing he laws of physics, but hey you have my best wishes!
_________________________
paul

Axiom M80, VP180, Qs8, EP500
Panasonic PT-AU900
AudioTrak AT-6100
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#323020 - 09/17/10 10:44 AM Re: Projector bulb - need a new one! [Re: MarkSJohnson]
alan Offline
connoisseur

Registered: 01/29/02
Posts: 3188
Loc: Toronto/New York/Dwight
Hi Mark,

My Samsung DLP is still on the original bulb, which amazes me, although a friend of mine used to work in the quality-control lab for Samsung, and he told me that my generation of DLPs was spec'd at 5,000 to 8,000 hours of bulb life if you ran it in Cinema mode most of the time, which I do.

Another friend bought a "Sammie" DLP a year later than mine but he watches a huge amount of TV series and had to replace his bulb a year ago.

Mine was the generation of Sams to have an HDMI and a DVI input.

When I saw Worf's question, it didn't click for a minute that he had a front projector then I saw the model number of the Pannie. Front projector bulbs have a much shorter life because they have to "throw" an image across a room rather than a foot or two like a rear-projector. So the front projector bulbs run much brighter and hotter and don't last as long.

Regards,
Alan
_________________________
Alan Lofft,
Axiom Resident Expert

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#323021 - 09/17/10 10:48 AM Re: Projector bulb - need a new one! [Re: alan]
MarkSJohnson Online   happy
shareholder in the making

Registered: 09/27/04
Posts: 10899
Loc: Central NH
Thanks Alan.

For the record, nothing about me runs either hot nor bright...
_________________________
::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::

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#323022 - 09/17/10 11:18 AM Re: Projector bulb - need a new one! [Re: MarkSJohnson]
medic8r Offline
axiomite

Registered: 02/05/06
Posts: 6396
Loc: Fredericksburg, Virginia
Yeah, but you've got a wife that sends you Simpson porn in your email, so you've got that going for ya.
_________________________
"The Universe is the game of the self, which plays hide and seek forever and ever" - Alan Watts

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#323027 - 09/17/10 11:26 AM Re: Projector bulb - need a new one! [Re: medic8r]
MarkSJohnson Online   happy
shareholder in the making

Registered: 09/27/04
Posts: 10899
Loc: Central NH
Yeah, there IS that...
_________________________
::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::

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#323034 - 09/17/10 11:59 AM Re: Projector bulb - need a new one! [Re: MarkSJohnson]
michael_d Offline
connoisseur

Registered: 07/23/04
Posts: 3904
Loc: Up yonder
Front projector bulbs have a typical life expectancy of 2000 hours. I started calibrating my own displays a few years ago and as with any ‘hobby’, one learns things over time by speaking to others and learning things through practical experience. In my conversations with professional calibrators (who aren’t stingy with their advice), the 2000 hour rule is a pretty good one and universally accepted as “normal”. Projector bulb design is not hugely different between each manufacture. Most projectors have a low lamp and a high lamp mode (some call this different things, but it’s all the same). If you need to run the bulb in high lamp mode to get your preferred image luminance, life expectancy dips a bit, but not much. Some projectors are not affected by this at all, like the JVC projectors. Much of this is due to how well the projector bulb cooling system works. JVC’s have an excellent cooling system, which is why their life expectancy is not adversely affected by mode. But with this cooling, you have fan noise that is increased in high lamp mode, so pick your poison.

There is a common belief that just because the lamp still lights, the bulb does not need to be replaced. This is not entirely true. Even though the bulb lights and throws an image up on the screen, unless you have a light meter, it’s difficult to determine through casual viewing if the bulb needs to be replaced or not. As the bulb performance dips, you grow accustomed to this and do not notice it. I re-calibrate my projector every two hundred hours. Every time I do this, I have to make changes to keep grey scale and color gamut under a DE of 2. As the bulb ages, the light spectrum changes. Grey scale, gamma and gamut all start to drift. Lumens also changes, so white and black levels need to be adjusted to maintain my preferred luminance, which in turn affect grey scale, gamma and gamut.

Within the first 500 hours of use on a new bulb, lumens can be expected to decrease up to 50%. Lumens will remain relatively constant for the next 1000 hours or so, and then it does a nose dive.

But, if the image is still pleasing to you, all this really doesn’t matter and it’s not worth worrying about. Once you do, you will start down the rabbit hole and end up investing a lot of money and time to get back out the hole, but never really getting out.
_________________________


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#323045 - 09/17/10 12:44 PM Re: Projector bulb - need a new one! [Re: michael_d]
jakewash Offline
shareholder in the making

Registered: 12/26/03
Posts: 10398
Loc: Calgary, Alberta
Originally Posted By: michael_d
Front projector bulbs have a typical life expectancy of 2000 hours. I started calibrating my own displays a few years ago and as with any &#145;hobby&#146;, one learns things over time by speaking to others and learning things through practical experience. In my conversations with professional calibrators (who aren&#146;t stingy with their advice), the 2000 hour rule is a pretty good one and universally accepted as &#147;normal&#148;. Projector bulb design is not hugely different between each manufacture. Most projectors have a low lamp and a high lamp mode (some call this different things, but it&#146;s all the same). If you need to run the bulb in high lamp mode to get your preferred image luminance, life expectancy dips a bit, but not much. Some projectors are not affected by this at all, like the JVC projectors. Much of this is due to how well the projector bulb cooling system works. JVC&#146;s have an excellent cooling system, which is why their life expectancy is not adversely affected by mode. But with this cooling, you have fan noise that is increased in high lamp mode, so pick your poison.

There is a common belief that just because the lamp still lights, the bulb does not need to be replaced. This is not entirely true. Even though the bulb lights and throws an image up on the screen, unless you have a light meter, it&#146;s difficult to determine through casual viewing if the bulb needs to be replaced or not. As the bulb performance dips, you grow accustomed to this and do not notice it. I re-calibrate my projector every two hundred hours. Every time I do this, I have to make changes to keep grey scale and color gamut under a DE of 2. As the bulb ages, the light spectrum changes. Grey scale, gamma and gamut all start to drift. Lumens also changes, so white and black levels need to be adjusted to maintain my preferred luminance, which in turn affect grey scale, gamma and gamut.

Within the first 500 hours of use on a new bulb, lumens can be expected to decrease up to 50%. Lumens will remain relatively constant for the next 1000 hours or so, and then it does a nose dive.

But, if the image is still pleasing to you, all this really doesn&#146;t matter and it&#146;s not worth worrying about. Once you do, you will start down the rabbit hole and end up investing a lot of money and time to get back out the hole, but never really getting out.


Proof of bulb break-in.
_________________________
Jason
-----------------
TTTHHHPPPPPTTTT!

My HT

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