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This topic comprises 3 pages: 1 2 3
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Author
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Topic: Using a cinema bulb in an NEC digital projector
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Steve Guttag
We forgot the crackers Gromit!!!
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Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 06-07-2011 05:53 AM
Okay...that changes things a bit but not the lamp so much. You don't have a 2.39:1 Scope image (it is too narrow so you must be cropping a bit in width).
Your worst format is 3D Scope...needing 8600 lumens, or so. Your best format is 2D Flat needing a little less than 4300 lumens. Again, the DXL-20SN3 is the best choice for this range.
Monte...define "preferred?" They are "approved." NEC is distributed by Strong. Strong distributes LTI/Phillips lamps...care to guess WHY they are on the approved list? Though, honestly, unless the lamps cause harm to the projector, (and fit), most any lamp should be "approved." The question is the light output of these non Digital lamps. Remember, it isn't light radiating from the arc that we are interested in, it the light throughput though the machine that we are.
The Helios lamps are not "digital" lamps. They are short gap standard lamps. They give an immediate satisfaction in the film application because they are brighter than they standard LTI lamp of the same wattage. However, what they don't boast about, is that their decay is also much steeper than a standard lamp. So, yes, in that first 100-hours, things look pretty good...but the light continues to dwindle at a pretty good clip.
The digital lamps coming out of Ushio are designed to get more light though the projector to begin with and to hold that light level longer too. A problem with say an XBO 3000W/HS lamp is that it does not know what lamphouse it is going in (film or digital, for that matter). It could be in an Ultra-80, Xetron, Kinoton....etc...all with different optics. A DXL-30SN3 was designed specifically for the NEC projector's optics to get the maximum out it. It doesn't fit the Barco, Christie or Sony.
As for NEC's least light efficient...well, it is on any given lamp size, regardless of who makes the lamp. Put a 4K lamp in an NC2000 and you get a whopping 11,800 lumens. Christie is doing that with 1800-2000 watts. Barco is doing it with between 2000-3000 watts. Yes, there is the uber-bright 4KW for the NEC that gets it to 17000 watts...for 500-600 hours. Christie is there with 3KW, Barco is there with 3KW on the B series or 4KW on the C series but lasting 1000-hours. You could make this comparison at any given lumen needed on any of their projectors...they just are not as light efficient as the other choices. Mind you, I have had ZERO problems with the NEC. They are not bad but they are not efficient. It makes them expensive to operate.
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