This is topic 5K Bulbs - Different pin size frustration in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.
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Posted by Dan Reiter (Member # 1386) on 11-13-2002, 03:45 PM:
Has anyone else out there been frustrated by the different 5K bulbs out there? The Osram is one design, and most others follow the 4K architecture. The result is different Negative pin diameters, bulb lengths, and arc locations. As a manufacturer and parts distributor, it sometimes causes extra problems if the manufacturer of the bulb is not specified when ordering a bulb adapter.Also, why just the 5K?
Just curious,
Dan
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Posted by Steve Guttag (Member # 268) on 11-13-2002, 04:48 PM:
Certain lamps inititate the package size. For instance, the 1600HS initiated the size of the 1600, 1000 and 700HS...The 2500HS originated its size and the 2000HS and 3000HS conform.
The 3000HW has always had a larger pin than the 4000HS. When the 7000 watt lamp came out, the 7KW conformed to the 4000HS standards...most lamp manufacturers have filled the inbetween sizes based on that standard...that is the 5000HS and 6000HS (if the manufacturer supports them) have the same pin size though not all use the same ferrule diameters. Perk and Elmer (ORC) have always used HUGE ferrules.
OSRAM, I guess, took the opportunity to go with a larger pin when they made the 5KW.
Christie is a least consistant...they use an HTP lamp with the same threaded pin on all sizes!
Steve
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"Old projectionists never die, they just changeover!"
Posted by Pat Moore (Member # 380) on 11-14-2002, 09:33 AM:
Frustration is shared by manufacturers like us as well. Strong long ago "standardized" on H or HS style lamps. In the last few years, we've probably contributed by satisfying customer's requests of handling other lamp styles in our consoles and lamphouses. Seems like the bulb manufactures have a license to make lamps with all kinds of pin types and diameters and cathode focus points, and we end up making all kinds of adaptors to handle them. Seems like if an 8mm pin is sufficient for a 4kw and 7kw lamp, it should be fine for a 6kw and 5kw lamp as well. We're all for uniformity...Pat
Posted by John Pytlak (Member # 331) on 11-14-2002, 09:43 AM:
Pat Moore wrote: "We're all for uniformity...".Time to ask SMPTE to develop standards. Or would another standards organization have jurisdiction?
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John P. Pytlak, Senior Technical Specialist
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Research Labs, Building 69, Room 7525A
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Posted by Pat Moore (Member # 380) on 11-14-2002, 10:31 AM:
Gee, John, do we know anyone we can talk to? 
Seriously, I think that would be a tough go. Would be worth broaching the subject because it would make life so much easier for all concerned. The biggest problem might be internationally, where configurations are different as well, and are already "standard" in those regions.
Pat
Posted by Gordon McLeod (Member # 33) on 11-14-2002, 05:46 PM:
In the stage lighting world the 3 letter ansi codes don't even guarentee that all brands of lamps will physically fit into a given stage fixture let alone filament focus
Posted by Don Sneed (Member # 955) on 11-16-2002, 09:10 AM:
I can relate to this topic, I just finish installing a new 18-screen theatre which had two screens using 5K Osram bulb in a Strong console, the rear connection had a 18mm connector on the bulb, upon installing I could not get a focus, found out the rear collet was too short, called Strong, a new collet was order, new one came in the same way, I was told this was the only one Strong make for that 5K lamp.. I measure from the collet connection to the bulb's focal point & found I needed 3/4" longer the standard collet....When Strong's tech came out to aligned the consoles, saw the problem & made the new collet on site to fit...all was good now, but the bulbs had a problem with the metal to the glass was very loose, we order new bulbs to replace.....GUESS WHAT ??? The new bulbs are now 3/4" too long now !!! The bulbs are Osram 5000 W/H OFR.....What is Osram smoking, the same bulb numbers but some is 3/4 " too short or too long....So does mean the theatre may have to keep changing the collets each time they change a 5K bulb....Come on Osram put down the pipe down & keep the bulbs the same size !!!!
Posted by Pat Moore (Member # 380) on 11-16-2002, 10:47 AM:
Hi Don; I heard about this, of course. Sorry about that but we share your frustration. Stuff like this makes the "standard" idea far more appealing.We can all understand why there needs to be physical differences between different wattages, and why there might be two designs for the same wattage, and even manufacturers preferring threaded ends or clamped pins for the mounting and connections.
But how many versions and permutations do we need? Our internal lamp adapter chart in the office is a full 8 x 14 sheet, and based on your encounters it's about to change -- yet AGAIN! There are also 5kW lamps out there with 8mm pins, and their focus point is probably different as well.
Pat
Posted by Steve Guttag (Member # 268) on 11-17-2002, 02:09 AM:
We have run in to the mysterious OSRAM 5K HS (horizontal short) and the extra short version. I'd swear they are mistakes. Steve
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"Old projectionists never die, they just changeover!"
Posted by Dan Reiter (Member # 1386) on 11-18-2002, 07:48 AM:
I'm glad to see we at BIG SKY are not the only manufacturer getting headaches from this! We also try to keep up with all the different 5K bulbs, but can only react. Some day soon this issue will settle............
We help Superior Quartz, who are only a mile from our facility, and they follow the 4K architecture with their bulbs. Quite bright, getting there in life span. they are usually quite helpfull, though.
Thanks for everyone's input so far!
Dan