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Author
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Topic: RATIO OF AMPS TO WATTS
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John Pytlak
Film God
Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 04-02-2001 01:05 PM
You need to specify the particular lamp your lamphouse is using, as the recommended current and voltage vary among lamps.In general, a 1000-watt lamp will operate at a nominal voltage of 20 volts, and a nominal current of 50 amperes. Actual current may range between 35 and 55 amps, depending upon the lamp. A 1600 watt lamp requires a nominal voltage of 22-24 volts, and a current of 65 amperes, with actual current ranging between 50 and 65 amperes. Again, always consult the printed recommendations for your particular lamp, and stay within the recommended current range. ------------------
John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services, Entertainment Imaging
Eastman Kodak Company
Research Labs, Building 69, Room 7419
Rochester, New York, 14650-1922 USA
Tel: 716-477-5325 Cell: 716-781-4036 Fax: 716-722-7243
E-Mail: john.pytlak@kodak.com
Web site: http://www.kodak.com/go/motion
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Steve Guttag
We forgot the crackers Gromit!!!
Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 04-02-2001 10:13 PM
John is right on the consulting the manufacturer part. Part of the art of making the xenon lamps is getting the right gap spacing and such and all of that will determine the current and voltage and as such the wattage.As to the lifespan of a 1000 watt lamp...it all depends on orientation and lamp design. The Short Arc versions with the "HS" suffix don't tend to last as long but are more light efficient than their big boy counterparts and are also a bit more stable at the steeper angles. "1600" watt lamps typically have a manufacturer's nominal power specification of 1400 watts...therefore you have the electic bill of 1400 watts but the light output of 1600 watts (I guess this is in reference to a 1000 watt lamp). Personally, I think it is just wattage inflation...call it what it is. In short, merely stating that you are pulling 45 amps is insufficient to tell what the lamp size you have nor sufficient to tell you what electrical power (wattage) you are consumming. Telling us the voltage will determine the power consumption but still won't tell us the lamp wattage. Steve ------------------
"Old projectionists never die, they just changeover!"
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Paul G. Thompson
The Weenie Man
Posts: 4718
From: Mount Vernon WA USA
Registered: Nov 2000
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posted 04-04-2001 09:02 PM
Brett, it sounds like the bulb is being over driven. Presuming the meter is accurate right down to the fly speck, and presuming the load voltage is 20 volts, the bulb is being operated at 560 watts if it is drawing 28 amps, or 600 watts if it is drawing 30 amps.The next step might just be a big KABOOM! I would recommend the bulb be kept within operating parameters. Also, check the lamphouse blower and screen, as well as the venting system. Make sure it has the proper CFM draw.
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