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Discussion Starter · #1 ·
I have several Digital Projection HiLite projectors with the lamps initially running at 85% power on a single surface and after 400 hours some of the lamps were dimming noticeably compared to projectors on adjacent channels. They also began to flicker at around 600 hours.


So I raised the power to 90% to stop the flicker and since then have seen a continual drop in brightness.


What's the scoop on UHP lamps? At this rate I'm going to have to change lamps at 1000 hours, a pretty expensive proposition.


My last projectors (Christie) used CERMAX lamps and I didn't see dimming like this till well after 1200 hours or so.
 

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Discussion Starter · #2 ·
Anybody???


Isn't anyone here using high end projectors with UHP lamps and having good or bad results?


I have a bit over 700 hours on them and at this rate I don't expect even 1000 hours of useful life from each lamp.
 

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What is the screen gain? How much ambient light? The bulbs will dim, but these other factors if optimal can get you that extra 1-1500 hours.
 

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Discussion Starter · #4 ·

Quote:
Originally Posted by ivanhoek  /t/1469912/uhp-lamp-life#post_23245967


What is the screen gain? How much ambient light? The bulbs will dim, but these other factors if optimal can get you that extra 1-1500 hours.

I understand that lamps dim, I've been supporting this theater for 9 years so I'm no newbie. I previously had 12 Christie DLV1280's there without this much of an early life dimming with CERMAX lamps.


The screen gain is not the issue, the theater is painted black, near zero ambient light, the issue is the bulbs dimming DRAMATICALLY over the first couple of hundred hours.
 

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I have no experience with high end projectors but with the consumer grade home theater projectors the lamps dim considerably after the first 300 hours. This is why we need to keep in mind screen size as the projector may be able to light up the screen when new, but after it ages a few hundred hour, can no longer provide the proper lighting.


Are you buying the OEM lamps from the projector manufacturer or aftermarket compatible lamps? Typically from the consumer end there are 2 types of lamp, OEM and anything else. The OEMs typically cost more but last much longer, and dim less. What are you installing in your projectors?



Have you measured output of the projector with a new lamp and the fl off the screen? Does it match the manufacture claim? Have you made the same measurements after it dims?

What does the lamp manufacture have to say about your issue?
 
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