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Author Topic: Vertical And Horizontal Xenon Bulb Working Position Marin Zorica Jedi Master Film Handler Posts: 671 From: Biograd na Moru, Croatia Registered: May 2003 posted 05-05-2004 10:39 AM                     I saw that lot of "older" projectors had a lamp house with vertical xenon bulb, and today, modern kind of projectors had a horizontal position xenon bulb in lamp house, mostly with aspheric dichroic mirrors as far i know, i saw also that in some horizontal lamp hoses bulb plus " " is in mirors, and on other is oposite off mirror. Why is this like that, and what are differences between horizontal and vertical lamp working position??? Also for XBO1600w/ofr, and XBO2500/ofr what is required power of rectifier, and what is ignition voltage of this lamp?? Thanks, Marin  |  IP: Logged Jeremy Fuentes Mmmm, Dr. Pepper! Posts: 1168 From: Corpus Christi, TX United States Registered: Jan 2004 posted 05-05-2004 10:42 AM                     I could be wrong, but I believe the bulb lasts longer when it is in vertical position. Or at least doesnt have to be rotated as much.  |  IP: Logged Aaron Sisemore Flaming Ribs beat Reeses Peanut Butter Cups any day! Posts: 3061 From: Rockwall TX USA Registered: Sep 1999 posted 05-05-2004 11:26 AM                     The only vertical lamphouse manufatured today is made by Lighting Images Technology . The sole advantage to vertical lamps is that in practice the bulbs can last a VERY long time, when properly cooled, as there is no sagging of the electrodes or uneven blackening of the lamp (both are reasons that horizontal lamps have to be rotated at regular intervals). The worst part of a modern vertical lamphouse is the requirement for the diagonal 'folding' mirror that turns the light beam 90 degrees- it is notorious for robbing valuable light. Vertical/folding mirror lamphouses are also more difficult to align than their horizontal counterparts. -Aaron  |  IP: Logged Thomas Procyk Phenomenal Film Handler Posts: 1842 From: Royal Palm Beach, FL, USA Registered: Feb 2002 posted 05-05-2004 11:55 AM                     Hmmm. I had a tech tell me a long time ago that we should NEVER rotate our xenon bulbs, because it "cuts the life in half" when you do so. Theater I was at at the time had Big Sky lamphouses. I don't mess with the things. Not paid enough. =TMP=  |  IP: Logged John Walsh Film God Posts: 2490 From: Connecticut, USA, Earth, Milky Way Registered: Oct 1999 posted 05-05-2004 11:58 AM                     There's also les flickering when mounted horizontal.  |  IP: Logged Bruk Mogos Film Handler Posts: 19 From: USA Registered: Nov 2003 posted 05-05-2004 08:48 PM                     horizontal mounted lamps last longer and they have great output of light and they don't have to be rotated,as to vertical mounted lamps you loose some light since it's reflecting through the mirror, and they consume more electricity to compensate for the loose of light. ex. (7000W vertical = 4500W Horizontal) and required power of rectifier for XBO 2500W- I think is 25 Volts 75 AMP,I don't know about 1600w.  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 05-05-2004 09:44 PM                     "horizontal mounted lamps last longer and they have great output of light and they don't have to be rotated,as to vertical mounted lamps you loose some light since it's reflecting through the mirror, and they consume more electricity to compensate for the loose of light. ex. (7000W vertical = 4500W Horizontal) and required power of rectifier for XBO 2500W- I think is 25 Volts 75 AMP,I don't know about 1600w. "I would check some facts first Horsizontal lamps do not last as long the XBO2500OFR holds the record on that department in vertical XenosolIII's aslo vertical lamps don't get rotate horizontals in many cases must be rotated A vertical in the convential design is less efficient but will produce a flatter light field if fitted with an auxilory reflector also John said"There's also les flickering when mounted horizontal. "Horizontal lamps will flicker worse as they are by nature unstable and require magnetic stabalization The reason some lamps are mounted backwards is to keep the anode higher than the cathode in steep inclined locations (spotlight for example) a 2500 watt lamp is designed for 80-100amp operation  |  IP: Logged John Walsh Film God Posts: 2490 From: Connecticut, USA, Earth, Milky Way Registered: Oct 1999 posted 05-06-2004 08:24 AM                     Opps! Gordon is right; I meant to write 'vertical.'  |  IP: Logged David Rigby Expert Film Handler Posts: 134 From: Chorlton, Manchester, UK Registered: May 2002 posted 05-06-2004 10:56 AM                     What physical attribute of a horizontal bulb prevents it working in a vertical position - is it just that it's too short? If so can metal extenders be used to correct the length? (since I need to do this anyway to use 500 or 1000W lamps in my 2K lamphouse )  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 05-06-2004 11:03 AM                     Horizontal lamps burn quiet happily when mounted vertically the reverse isn't true and they require very high magnetic stabalization if done so  |  IP: Logged David M. Dorn Film Handler Posts: 35 From: Hartford, CT USA Registered: Mar 2004 posted 05-07-2004 09:10 PM                     While we are on the topic of verticle lamps, I noted that the Cinemeccanica CX 1600 Lamphouse had a verticle lamp but did not use a 45 deg. mirror. The illuminaton was foucused by a shallow reflector. Did any other manufactures take this approach? And if not, why not, given the improvement in lamp life using the verticle postion.  |  IP: Logged Richard Fowler Film God Posts: 2392 From: Ft. Lauderdale, FL, USA Registered: Jun 2001 posted 05-07-2004 09:18 PM                     When the CX1600 was designed there where other manufacturers also using the "Butterfly" type of shallow reflector in the 1960 -70's period...very inefficient but long bulb life.  |  IP: Logged John Pytlak Film God Posts: 9987 From: Rochester, NY 14650-1922 Registered: Jan 2000 posted 05-07-2004 09:37 PM                        Such as the Zeiss-Ikon Xenosol lamphouses, which also had a "honeycomb" condenser lens assembly. We had a pair in one of our screening rooms in the early 70's.  |  IP: Logged David M. Dorn Film Handler Posts: 35 From: Hartford, CT USA Registered: Mar 2004 posted 05-07-2004 10:10 PM                     John, Am I correct to assume the Xenosol's condenser lens was between the lamp and aperture, like that on a condenser equipped photographic enlarger? I also assume the honeycomb concentrated the light much like a tail light reflector.  |  IP: Logged John Pytlak Film God Posts: 9987 From: Rochester, NY 14650-1922 Registered: Jan 2000 posted 05-07-2004 10:22 PM                        It's been a long time, but I recall the vertical lamp had about a 3-inch diameter spherical "auxillary reflector" reflecting light back toward the main reflector, and two honeycomb condenser lenses mounted together near the snout of the lamphouse. There's a photo in the "Pictures" section: http://www.film-tech.com/pics/royal/royal.html Or in some that Gordon took: http://www.cinephoto.co.uk/gordon_mcloed_2.htm Here's some history of ZeissIcon: http://www.phototechnik-online.de/ZeissIcon/ZeissIconAG.htm  |  IP: Logged

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