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» Film-Tech Forum   » Operations   » Digital Cinema Forum   » CDXL-30 Bulbs and tolerances

Author Topic: CDXL-30 Bulbs and tolerances
Andy Muirhead
Master Film Handler

Posts: 323
From: Galashiels, Scotland
Registered: Dec 2000

 - posted 09-02-2009 03:27 PM      Profile for Andy Muirhead   Email Andy Muirhead   Send New Private Message       Edit/Delete Post 

Anyone know the safe tolerances on these bulbs (CDXL-30 3kW)? We have one which is run at 1.5kW for 2D and 2.5kW for 3D. I usually go by 10% but have no experience of these new bulbs, but it can't be right to under run as much as this?

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David Zylstra
Master Film Handler

Posts: 432
From: Novi, MI, USA
Registered: Mar 2007

 - posted 09-02-2009 04:24 PM      Profile for David Zylstra   Email David Zylstra   Send New Private Message       Edit/Delete Post 
I know Christie has done some testing of running the CDXL lamps lower than the normal recommended amperage range. I had a CP2000H auditorium where we monitored a CDXL-45 at low power and took weekly readings of a CDXL-45 at 50% for Christie. My test data shows that we ran flat at 51% and scope at 70% (% is based on a max current of 155amps for the CDXL-45) - I could not tell you the mix of scope and flat movies across the lamp's life though. For near 130% of the warranty life the lamp ran without any issues.

My new location of all ZX projectors has many CDXL-20 and -30 lamps running lower than 70% for flat - so far after about 1,000 hours we have seen no issues.

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Steve Guttag
We forgot the crackers Gromit!!!

Posts: 12814
From: Annapolis, MD
Registered: Dec 1999

 - posted 09-02-2009 04:30 PM      Profile for Steve Guttag   Email Steve Guttag   Send New Private Message       Edit/Delete Post 
The Christie lamps do have a very wide operating range...check their literature on what the range is. On the CDXL-30, you can go up to 120A (Whereas most 3Ks top out at 110A)...the bottom end is indeed pretty far down, as I recall.


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