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Author Topic: bulb life for Barco DPK20c Chase Taylor Expert Film Handler Posts: 175 From: Troy, Alabama, USA Registered: Mar 2001 posted 06-06-2012 08:14 AM                        While I've had some Osram's 4K's make it to the 1000hr mark lately it has just been that lately, just within the last few months. I tell everyone to use Ushio's as I've had great luck with them over the last few years.  |  IP: Logged Dave Macaulay Film God Posts: 2321 From: Toronto, Canada Registered: Apr 2001 posted 06-06-2012 08:58 AM                     I don't see the advantage to using normal mode. The CLO sensor is not perfect but it's pretty good if you calibrate it close to your target ft-L on screen. Also, you must set the lamp back to normal mode for lamp alignment. Barco should have the system go to standard mode when you open the alignment window, possibly it will in a future release. My experience is that sufficient exhaust air volume is vital to get lamp life approaching warranty. I've seen systems where the extractor was "measured" at well over the minimum volume by using a fan type airflow measurement on the open duct. Then the lamp life is pathetic, and when I measure the airflow using a probe in the duct with it connected... volume is way below spec. The biggest problem is with 3D screens. To get acceptable light at 70% lamp power requires a lamp that will be double or triple the correct light level in 2D at minimum power. Using two lamphouses - one for 3D and one for 2D with a smaller lamp - in a Barco projector makes sense and will eventually pay for itself, but I haven't seen a theatre actually do this. Defocussing a Barco lamphouse is pretty easy but this can damage the light processor or cold mirror.  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 06-06-2012 10:49 AM                     Yeah...stop using Osram and switch to a good lamp...like Ushio...then you will make your hours and have more light doing it!  |  IP: Logged Antti Nayha Master Film Handler Posts: 268 From: Helsinki, Finland Registered: Oct 2008 posted 06-06-2012 01:06 PM                     quote: Dave Macaulay Defocussing a Barco lamphouse is pretty easy but this can damage the light processor or cold mirror. A Barco tech rep said that there's no harm in doing this. You can check by yourself by looking at the temperatures in Communicator. Apparently the system is designed well enough. Just curious: has anybody heard a similar (or an opposite) statement from NEC or Christie? Some people say that defocusing the bulb hurts your light uniformity on the screen, but I haven't seen any problems on a naked eye so far. (On a Barco, that is. Naturally I'm familiar with the phenomenon on film projectors.) I've been meaning to do some proper testing with a light meter, but didn't get around to it yet... promise do that later in June and post the results!  |  IP: Logged Joris Springer Film Handler Posts: 83 From: Almere, Flevoland, The Netherlands Registered: Feb 2007 posted 06-17-2012 07:46 AM                     I find this a very interesting thread, at my work we are having some strange failures with the Osram 4K and 3K lamps when they reach around the 700 hours. Around that time they have around the 360 strikes and technical support tells us that it is because of the strikes that the lamp refuses to start and even turns itself off during the shows. However, we have the problem only with the DP2K-20C, 15C and 19B. When they were just installed we heard from a different company that that happends often because the lamps were installed in the factory and so during transport they get quite a lot of bumps but now with the next set of lamps we are having the same problem all over again. Guess I have to call to Osram and confirm how long the lamps can burn with guarantee.  |  IP: Logged

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