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perisoft
Joined: 29 Aug 2007
Posts: 2920
Location: Ithaca, NY
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| Posted: Thu Dec 06, 2007 12:50 am Post subject: Tube lifetime vs. brightness level |
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So, I'm setting up my 808s finally. I'm thinking about doing some simple rosco color filters (spoiled after the 1271, heh) as I can't afford hd145s yet.
Trying to choose between a 96 and a ~84" screen (84 would let me fit it on a 4x8 sheet of something).
So, here's the question: The filtering will drop the light level, and while the room will be totally controlled (dark fabric walls/ceiling, black background, black over the screen, etc) I'd like to get some pop out of the thing. The 1271 on a 55" screen really looked great, but I'd like to go a bit bigger screen wise.
Assuming I'm using the PJ around 10 hours a week, will running higher gains / contrast significantly reduce lifetime? I've got a slightly worn blue, a 6.7 green, and a good red. Red and blue have 4k, green has 9k chassis hours, unknown tube hours.
Am I going to get 1 year out of it vs. 3 if I run 85 contrast vs. 65? 6 months vs. two years? I have no idea what the penalties are; whether it's linear (half as long at 100 vs. 50) or exponential, or whatever.
Any suggestions? I figure if I can use it for three years I'll be able to source new tubes or get a new PJ by then. 2 years would be the lower end of how long I'd like to be able to use these tubes with good effect.
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Tom.W
Joined: 09 Mar 2006
Posts: 6635
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| Posted: Thu Dec 06, 2007 2:55 am Post subject: |
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Go for the smaller screen and kick up the contrast a bit. If your green is a 6.5 try 65 to 70 on the contrast setting. At 60% my BD 808 looks great even with 4,000 hours on new OEM tubes.
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Thu Dec 06, 2007 6:33 am Post subject: |
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| Tom.W wrote: | | Go for the smaller screen and kick up the contrast a bit. |
I'll provide a counterpoint.  Damn the tubes and go big!!!
I've been using my 1271 on a 96x54 WilsonArt screen (about 1.1-1.2 gain) in my totally light-controlled room. Since April or May when I started using the theater, I've put probably 400 hours or so on it; I now have right at 3000 hours on the clock.
I run brightness and contrast at 50 and 60, respectively. I'm very sensitive about image quality, so it's damn close to opitmal without going to full-on calibration. I had the lenses off probably 50 hours ago, and I could only just barely detect the ever so-slightest hint of wear on the blue tube.
So, let's say I'm running 350 hours/6 months or 700 hours per year. I'd imagine I could run this thing at least a couple more years before the blue tube will even start to show noticeable wear, let alone anything significant. I'll probably have another projector next year, and another the year after that. Even if I didn't, I'm pretty sure I could use this thing just the way it is for at least 2-3 years.
I LOVE my screen size. I definitely wouldn't want anything smaller. I love sitting in my sweet spot at 1.2x screen widths. It's a THEATER, dammit!!!
Don't forget a lot of these projectors that you see with fried tubes were in auditoriums on 10, 12, 15-foot wide screens, too far back from the screen (small wear pattern), and in rooms with some ambient light and therefore had contrast driven hard. We could run our projectors the way we do for 10 years or 8000 hours and not achieve the phosphor wear that some commercial installs got on them in a year or two and 1000 or 2000 hours.
SC
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Thu Dec 06, 2007 6:42 am Post subject: |
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One more thing... a 96x54 is just over 125% the area of a 85.333x48. That means, you'll get approx. 80% of the life out of the tubes at the larger screen size as compared to the smaller screen size. To use real hours for example, you'll get approximately the same wear in 3000 hours on the large screen as what you'd have gotten in 3800 hours on the smaller screen (assuming you've adjusted contrast to illuminate the screen at the same level).
Not a huge deal. Go for it!!! That's what these things are for!
SC
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Thu Dec 06, 2007 6:51 am Post subject: |
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Use the hell out of it. Another one (or 7 ) will pop up when you least expect it and will populate your place to the point you'll have to move and leave your place to the projectors. ( hasn't quite happened to me yet....)
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CRT.
HD done right!
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Zebu Fellenz
Joined: 21 Dec 2006
Posts: 2567
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| Posted: Thu Dec 06, 2007 10:51 am Post subject: |
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I wouldn't go under a 96" screen
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perisoft
Joined: 29 Aug 2007
Posts: 2920
Location: Ithaca, NY
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| Posted: Thu Dec 06, 2007 10:44 pm Post subject: |
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| AnalogRocks wrote: | | Use the hell out of it. Another one (or 7 ) will pop up when you least expect it and will populate your place to the point you'll have to move and leave your place to the projectors. ( hasn't quite happened to me yet....) |
Presumably a bigger problem with Ampros....
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Zebu Fellenz
Joined: 21 Dec 2006
Posts: 2567
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| Posted: Fri Dec 07, 2007 12:20 am Post subject: |
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No No,
The problem with the Ampro's is all your space becomes taken up with spare parts forcing
you to move in with relatives who subsequently try to admit you to the mental asylum. 
Erik 
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perisoft
Joined: 29 Aug 2007
Posts: 2920
Location: Ithaca, NY
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| Posted: Fri Dec 07, 2007 4:05 pm Post subject: |
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| Zebu Fellenz wrote: | | I wouldn't go under a 96" screen |
Neither would I. It always scrapes my back on the way.
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Fri Dec 07, 2007 6:15 pm Post subject: |
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| perisoft wrote: | | AnalogRocks wrote: | | Use the hell out of it. Another one (or 7 ) will pop up when you least expect it and will populate your place to the point you'll have to move and leave your place to the projectors. ( hasn't quite happened to me yet....) |
Presumably a bigger problem with Ampros.... |
Hey I just turned down a WORKING Ampro. I did however just buy a Runco last week and I'm looking at another Sony.
I think gravity has been altered at my place in such a way as to atract leaded CRT glass to me.
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perisoft
Joined: 29 Aug 2007
Posts: 2920
Location: Ithaca, NY
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| Posted: Fri Dec 07, 2007 8:49 pm Post subject: |
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| AnalogRocks wrote: | | perisoft wrote: | | AnalogRocks wrote: | | Use the hell out of it. Another one (or 7 ) will pop up when you least expect it and will populate your place to the point you'll have to move and leave your place to the projectors. ( hasn't quite happened to me yet....) |
Presumably a bigger problem with Ampros.... |
Hey I just turned down a WORKING Ampro. I did however just buy a Runco last week and I'm looking at another Sony.
I think gravity has been altered at my place in such a way as to atract leaded CRT glass to me. |
Better watch out, you might get a thing for oscilloscopes...
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