This is topic RATIO OF AMPS TO WATTS in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.
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Posted by Jack Culpepper (Member # 724) on 04-02-2001, 12:34 PM:
THIS INFORMATION WILL BE HIGHTLY APPRECIATED. I HAVE AN ORC LAMPHOUSE THAT PULLS APPROX. 45 AMPS. IS THIS APPROPRIATE FOR A 1000 WATT BULB OR A 1600 WATT BULB? IF ITS A 1600 WATT BULB,AND I DON'T KNOW IF IT IS OR NOT, HOW MUCH MANY AMPS WOULD A 1600 WATT XENON BULB PULL?
Posted by Ian Price (Member # 14) on 04-02-2001, 01:02 PM:
PLEASE DON'T SHOUT! Which is what it looks like when you post in all caps.I sure I will be corrected, but most lamphouses put out 25 volts. If you multiply your volts by your amps you get your wattage. In your case this would be 1,125 watts. This is a little too much for a 1,000 watt lamp and will result in excess heat and a shorter life span. Of course in a 1,000 watt lamp the life span is like 3,000 hours or better so you may not notice. It is probably ok for a 1,600 watt lamp to run that low but you can go higher. You could go as high as 60 amps and get good light and life out of the 1,600 watt lamp.
Ok ya big tech boys, correct me if I got this wrong.
Posted by John Pytlak (Member # 331) on 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.
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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
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Posted by Randy Stankey (Member # 64) on 04-02-2001, 10:11 PM:
Look in the box your lamp came in. There ought to be a card or piece of paper that gives the specs.
Yes, lamps and lamphouses vary a bit but the specs on that sheet are the last word, as far as I'm concerned. You can go over or under by a volt or two but if you are to high or low, you've got a problem that had better get fixed before you have a catastrophic problem. (ie: Lamp go BOOM!)IMHO: You should never burn your lamps at more than the maximum limits on the spec sheet, nor should you burn them at less than 80%.
Posted by Steve Guttag (Member # 268) on 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
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"Old projectionists never die, they just changeover!"
Posted by Gordon McLeod (Member # 33) on 04-02-2001, 10:19 PM:
Also it is a good idea to specify the model number and make of the lamphouse and the rectifier
Also the lamp itself will have engraved on the stem the wattage
Posted by John Eickhof (Member # 323) on 04-03-2001, 01:10 AM:
If it is a model M1000 it is rated at 19-23 volts @ 45 amps MAX! this unit is best used with a 700 watt bulb! (20v @35 amps) To accurately calculate wattage, you must have an accurate voltage and amperage reading fisrt! An error of 1 or 2 on either multiplier makes a lot of difference!------------------
John Eickhof President, Chief Slave
Northwest Theatre Equipment Co., Inc.
P.O.Box 258
Wendell, ID. 83355-0258
208-536-5489
email: jeickhof@nteequip.com
Posted by Gordon McLeod (Member # 33) on 04-03-2001, 08:48 PM:
Orc claimed that the M1000 (with a 700watt lamp produced the same light out put as a 1KW verticle so that is how it got the misleading M1000 designation
The M1600 is a 1000 watt unit
Posted by Brett Rankin (Member # 31) on 04-04-2001, 06:09 PM:
Anyone know how many amps I should be runnung a 500w xenon VERTICAL bulb at? I've been drawing around 28-30 amps but because the bulb is blackening with only a few hundred hours on it, it leads me to suspect that it may be a bit high...
Posted by Paul G. Thompson (Member # 655) on 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.
Posted by Michael Labbe (Member # 148) on 04-04-2001, 09:27 PM:
I sent Brad a copy of this old spec sheet regarding current levels. Hopefully this will help shed some light.
CLICK HERE