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Multiple on/off cycles bad for Epson 8700ub?

post #1 of 12
5/22/12 at 9:39pm
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I heard that my old Sanyo PLV-Z2's bulb would last longer if I didn't turn the PJ on and off unnecessarily. Therefore, when I took a 15 minute break from viewing, I left it on and paused. I'm sure that the thought that turning the PJ on and off a lot wasn't good for the bulb factored into my decisions at times whether to turn it on to watch a 1/2 hour video. I'm wondering if this should be my m.o. with the 8700ub. I heard something about some PJs not applying full power to the bulbs when they are warming up in order to mitigate the deteriorating effects of the on/off cycles on bulb life. What's the situation with the 8700ub in this regard? I noticed that the 8700ub starts off quite dim, and am wondering if this is intentional in order to not stress the bulb while the PJ "warms up."
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post #2 of 12
5/23/12 at 12:18am
Turning the projector on and off unnecessarily is bad for ANY projector. I leave mine on if I'm going to watch again within about 1 hour.
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post #3 of 12
5/23/12 at 12:59am
You can watch if for 6hrs but when you turn it off you have to wait 2 to 3hrs so the filiment is fully cooled down before starting up again.

What happens is the filiment gets out of alignment if it's not fully cooled down before you fire up again. After a while it gets so off tilt it dims out it can even fail.
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post #4 of 12
5/23/12 at 6:45am
Thread Starter 
Is it a good idea if leaving it on for a while (content paused, probably) to leave it on a blank screen or at least have the player on a dark frame? I've been wondering this for years.
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post #5 of 12
5/23/12 at 2:59pm
They say that's not good for LCD & SXRD's but no problem with DLP.
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post #6 of 12
5/23/12 at 4:24pm
Quote:
Originally Posted by guitarman View Post

You can watch if for 6hrs but when you turn it off you have to wait 2 to 3hrs so the filiment is fully cooled down before starting up again.

What happens is the filiment gets out of alignment if it's not fully cooled down before you fire up again. After a while it gets so off tilt it dims out it can even fail.

2 to 3 hours? I did not know it was that long.
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post #7 of 12
5/23/12 at 5:53pm
There is no filament in a metal halide lamp. There are two electrodes that make an arc similar to an arc welder but the arc is contained in the arc chamber. To be safe you should wait at least 10 minutes before re-striking the lamp. One of the reasons that re-striking too quickly kills the lamp is the arc chamber distorts because it doesn't get a chance to cool down and it oblongs out without proper cooling. If you can get into the projectors service menu and increase the shutdown cycle time you should because it gives the fans in the projector more time to cool the lamp before shutting off entirely.

Bohanna
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post #8 of 12
5/23/12 at 7:31pm
Thread Starter 
Quote:
Originally Posted by Bohanna View Post

There is no filament in a metal halide lamp. There are two electrodes that make an arc similar to an arc welder but the arc is contained in the arc chamber. To be safe you should wait at least 10 minutes before re-striking the lamp. One of the reasons that re-striking too quickly kills the lamp is the arc chamber distorts because it doesn't get a chance to cool down and it oblongs out without proper cooling. If you can get into the projectors service menu and increase the shutdown cycle time you should because it gives the fans in the projector more time to cool the lamp before shutting off entirely.

Bohanna

I notice that my Epson 8700ub shuts down way faster than my old Sanyo PLV-Z2. It's like 15 seconds vs 45 seconds, I haven't measured it I'm just guessing. I'll see if I can increase the shut down time on the Epson.
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post #9 of 12
5/23/12 at 7:33pm
Thread Starter 
Quote:
Originally Posted by Muse View Post

Is it a good idea if leaving it on for a while (content paused, probably) to leave it on a blank screen or at least have the player on a dark frame? I've been wondering this for years.

Quote:
Originally Posted by guitarman View Post

They say that's not good for LCD & SXRD's but no problem with DLP.

Are you referring to the above?
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post #10 of 12
5/23/12 at 7:43pm
It might actually be good for the projector if your lamp warranty is about to expire :P
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post #11 of 12
5/24/12 at 12:21pm
The downside to leaving a lamp on with no image is the possibility of burning out the LCD screens and polarizers especially the blue ones since the UV light produced by the lamp puts the most strain on these ones. If it were me and I knew I would have a half hour break from needing the projector I would turn it off instead of running the lamp hours up.
Bohanna.
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post #12 of 12
5/24/12 at 12:39pm
Quote:
Originally Posted by Muse View Post

I notice that my Epson 8700ub shuts down way faster than my old Sanyo PLV-Z2. It's like 15 seconds vs 45 seconds, I haven't measured it I'm just guessing. I'll see if I can increase the shut down time on the Epson.

I guess this would help explain why there are SO many complaints about epson lamp failures. I don't know about the epsons service menu but the sanyos have a standard menu number of 3 which translates into a minute in a half shutdown time or 30 seconds per number. FYI- I usually set it to 5 or 6.
Bohanna
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