my profile | my password | search | faq & rules | forum home

» Film-Tech Forum ARCHIVE   » Operations   » Digital Cinema Forum   » Dimming on a chrstie 2210,2220 and 2230 (Page 1)

This topic comprises 2 pages: 1  2

Author Topic: Dimming on a chrstie 2210,2220 and 2230 David Gibbons Film Handler Posts: 15 From: leesburg , fl Registered: May 2019 posted 07-30-2019 09:31 AM                     So I currently work on 26 projectors all ranging from 2210s to 2230s and they have begun to dim so my quick question is what are some possible solutions. After reading the manual for them it says that I need to run FL calibration after every lamp change but currently dont have acsess to a light meter at this time what are some of the ones you all use  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 07-30-2019 10:33 AM                     First question that springs to mind is: how do you know they are getting dimmer? The Christie fL reading is basically useless as it's not calibrated per format.  |  IP: Logged David Gibbons Film Handler Posts: 15 From: leesburg , fl Registered: May 2019 posted 07-30-2019 11:54 AM                     Just observation oner time really  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 07-30-2019 01:03 PM                     do you ever get your projector serviced? Is your service engineer carrying a colour meter?  |  IP: Logged Frank Cox Film God Posts: 2234 From: Melville Saskatchewan Canada Registered: Apr 2011 posted 07-30-2019 04:53 PM                        Are your screens getting grubby and covered with crap? Are your lamps being run over-powered or until they're good and dead? Are you running the automatic lamp focusing program that's built into the projector whenever you change a lamp?  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 07-31-2019 10:04 AM                     Hi David - if you are responsible for 26 projectors, it is probably a good idea, and the money should be there, to buy a decent light meter. For the job to check brightness over time, different solutions are available, some may cost only a few $, while a decent 'real' light meter is probably around 500 US$. - Carsten  |  IP: Logged David Gibbons Film Handler Posts: 15 From: leesburg , fl Registered: May 2019 posted 07-31-2019 10:57 AM                     Ok sorry about not getting back to anyone but here we go 1 yes lamploc is run as part of the new Lamp install 2 lamps run at 100% power and only till warranty hours 3 yes we are looking at getting a light meter and was just wondering what other people use  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 08-02-2019 08:19 AM                     I believe you answered your own question. One NEVER runs brand new lamps at 100% power until warranty. Any new lamp will grow dim quite fast. You are supposed to select a lamp so you can start off at ~70% give or take and increase the power gradually based on hourly usage over the warranty life to maintain screen brightness. Lamp Loc is supposed to do what I said above but in auto mode, but you should be starting out at much lower current and let it maintain brightness from there! I actually had a site with a 6KW lamp exlpode because of Lamp Loc. I set it at about 75% of max and the firmware did not tell us it was ACTUALLY AT full power. Right at its rated hours... K-Boom. Christie did cover the damage in all fairness, but I no longer trust Lamp-Loc. At least get a cheap Harkness or similar brightness meter and get yourself OUT of Lamp-Loc and above all get your replacement lamps properly sized by a qualified Tech! Your current tech isn't doing his job right. Mark  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 08-02-2019 01:07 PM                     Aren’t you referring to Lite-LOC? Lamp-LOC is the mechanical adjustment.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 08-02-2019 09:29 PM                     Yep!  |  IP: Logged John Thomas Film Handler Posts: 75 From: Boston, MA Registered: Sep 2011 posted 08-02-2019 09:56 PM                     Yes, always run LampLOC, which is Christie's automated mechanical lamp focusing system. Not a bad idea to take a glance at the x, y, and z values LampLOC ends up with after it finishes. If you see any of them maxed out in the positive or negative direction it could be a sign that your reflector is misaligned. Also take a look at your reflectors and dust them off safely. The reflective coating does degrade over time which will cost you light output. As already stated, dust your screens and/or have them cleaned. LiteLOC gets a bad reputation because people don't use it properly. Get a light meter and use LiteLOC. For optimal lamp life, you should set your LiteLOC target after installing a new lamp: Once it's installed and LampLOC has been run, manually set the power somewhere between 75%-85%. If you are not getting 14fL (measured using a light meter -- NOT what the projector says) in this power range, you should be using a different size lamp. Set the LiteLOC target here and save the lamp file. A xenon lamp's electrodes degrade over usage time. By setting the LiteLOC target in the 75%-85% range you are giving the lamp 15%-25% "room" to maintain good light as it degrades. Make sure you when you save the lamp file, that the channels (flat, scope, etc) you regularly use are referencing that file. This is commonly missed.  |  IP: Logged Stephan Shelley Jedi Master Film Handler Posts: 854 From: castro valley, CA, usa Registered: Nov 2014 posted 08-02-2019 10:34 PM                     If you have access to Christie's website they do have a couple of tech bulletins about this. Mostly about cleaning optics.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 08-03-2019 10:25 AM                     quote: John Thomas LiteLOC gets a bad reputation because people don't use it properly. Get a light meter and use LiteLOC. It also got a bad reputation all on its own because of firmware bugs! Mark  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 08-03-2019 10:51 AM                     Christie's implementation of Light-lock is wanting...its own douser fools it! When the douser opens and it can see the light again, it goes crazy trying to get it back in range. You'd think that it would put in checks that if the douser is closed/lamp is off...etc to not adjust the light. Additionally, it shouldn't worry about the light for a few minutes after it is turned on since the stability of the lamp has to be established first. Hopefully, the level it was at prior to turning off is close to where it needs to be when it comes back on. Barco really wins on the "CLO" feature (constant light output). Theirs works and works well. Barco's automatic lamp adjustment is expensive and miserable in performance. It takes 15 or so MINUTES and never gets it as good as a human can in about 1 minute. Conversely, Christie does win on automatic lamp adjustment where it gets it 95-100% right, 90% of the time (every once it a while, I've seen it get confused). NEC...well...they win at providing a number that has no bearing on actual light output whatsoever! The higher number may or may not mean it is brighter or more even. More often than not, it will lead you down the wrong path. They don't have auto lamp adjustment either. I have definitely noticed the light output degrading over time on all of the projectors. Cleaning those reflectors, even if they look good to the eye, really can make a difference. And, over time, depending on your environment, you might need to go through the entire optical chain to get some light back.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 08-03-2019 12:31 PM                     Steve, All of which is why I say leave the dam light loc or what ever your favorite projector maker calls it.... turned off. If you have a big plex get a simple light meter and compare it to your techs meter and maintain your brightness levels using the appropriate test pattern on a monthly basis. Digital Screen Checker  |  IP: Logged

All times are Central (GMT -6:00)

This topic comprises 2 pages: 1  2

Printer-friendly view of this topic

Hop To: Select a Forum: Category: Operations -------------------- Digital Cinema Forum Film Handlers' Forum Large Format Forum Ground Level Feature Info, Trailer Attachments & REAL Credit Offsets Category: Community -------------------- Film-Yak Film Handlers' Movie Reviews The Afterlife Bob Maar's Joke-A-Thon Category: Classified -------------------- Equipment and Supplies Wanted/For Sale Help Wanted/Seeking Employment Category: System -------------------- Software Beta Testing Forum

The Film-Tech Forums are designed for various members related to the cinema industry to express their opinions, viewpoints and testimonials on various products, services and events based upon speculation, personal knowledge and factual information through use, therefore all views represented here allow no liability upon the publishers of this web site and the owners of said views assume no liability for any ill will resulting from these postings. The posts made here are for educational as well as entertainment purposes and as such anyone viewing this portion of the website must accept these views as statements of the author of that opinion and agrees to release the authors from any and all liability.