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Topic: Best way to preserve lamp life?
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Joined: Jan 8, 2006
Posts: 13
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I own a Mitsubishi HC3 and just had the lamp start dimming on me in a bad way. This is very disappointing as I have only had the setup for 10 months. I had hopes of the bulb lasting me for about 2 years. It claimed to have a 2500 hour half life, but I have seen that my situation is not that all uncommon.

Now, before I put down $280 for a new bulb, I wanted to know some of the best ways to preserve the life of the bulb. I use the projector a good bit, but having said that, it amounts to at most 80-100 hours a month. I have the projector in "Theater" mode rather than the "Sport" mode which I gather is the econo mode for this model. Here are my thoughts of what I need to do, but I don't know if they are right.

1) I need to make sure to turn off the projector if I leave the room for more than 10 minutes.
2) Since heat is the worst enemy for the lamp, I plan on cutting it off every 2 hours or so to let it cool (unless I am in the middle of a movie rather than watching from the dish)
3) Cleaning the filter every 2 weeks
4) Set the timer on the projector to go off automatically after a specified period of time (due to me falling asleep in front of it)

Now, I feel that these are good things to do, but my main concern is with turning the projector on and off so much. Does this shorten the life of the bulb quickly. If I leave the room for 30 minutes knowing I will be returning to watch more, is it best to leave it on rather than turn it off just to turn it back on again.

I am looking for any and all suggestions as I do not want to have to pick up another bulb in less than a years time.
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Joined: Sep 10, 2005
Posts: 268
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1) Seems pretty short. I believe it has more to do with how long you leave it off. IOW if you turn it off then come back 20 minutes later and turn it back on, it is probably better to just leave it on. I have heard people hinting towards the 20 minute mark, but not sure if anyone has ever performed any tests that conclusively show where the "break even" point is, how many minutes each lamp strike takes off it's life. I think my 4805 makes you wait 1 minute before re-striking the lamp.

2) Again seems pretty short. Perhaps a rest every 4-6 hours might make more sense? Again, just going by what I have read previously, which may have been written by someone who does not know for sure, sort of like me.

3) Sounds like a good idea.

4) Man, I'd give my right *** for an auto off timer on the 4805. So much in fact, I am in the process of designing one as I have to think there are MANY people who would like one. Due to other priorities, I have been sleep deprived for literally 8 years. Thus, I fall asleep A LOT during movies, particularly if I am watching them alone.
Life is sexually transmitted
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Joined: Mar 25, 2005
Posts: 2,537
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The worst thing for bulb life is on/off cycles, not total hours. From reading about this on numerous forums, most suggest to leave projector on if you'll watch it again within 1 hour. Turning it off every 2 hours is not necessary, that's why they have "cooling fans". Your manual will tell you how often(in hours) to clean your filter screens, mine is 250 hours.
Mat
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Joined: Dec 1, 2005
Posts: 30
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I have just purchased a HDPJ52 and the manual stated not to put the fan in it's highest speed unless you had it sitting very high in the room or suspended because it may reduce the life of the lamp ... That of course sounds very weird to me since the more heat you can keep out of the unit the better I thougt it was for the PJ ... no matter where it was. I have sent Hitachi a question on this matter and am waiting to see what they will tell me ... Who knows ... maybe high speeds on fan isn't always the best for the lamps.
Then again they also sell you the replacement lamps so,
we shall see
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Joined: Jan 8, 2006
Posts: 13
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That is a little odd to me. I guess as heat rises, the fan needs to be on at a higher speed to cool the lamp. As for the HC3, the only way I can have the fan run at a higher speed would be by putting it in the "Sport" mode, which I gather is the "High Power" mode vs. "Econo" since the image becomes brighter at that setting. The fan kicks in at a higher speed, but I simply thought this was because the lamp would be burning hotter in this higher powered mode.

Having said all that, my projector is hanging about 1-2 feet from the ceiling. Would it be beneficial to run it in "Sport" mode? I figured that the "Theater" (econo mode?) would preserve the lamp life a little better.

Let us know what you hear from Hitachi.
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