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Old 11-10-2011, 12:59 PM   #29
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You could always put shutters on it and use it to send morse code to you buddy in....Oh, say the next state!

Definitely the coolest "flashlight" I have seen lately.
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Old 11-10-2011, 11:51 PM   #30
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This one time at Burning Man.....

Quote:
Originally Posted by Gringo View Post
hey did anyone else ever lay in a field of clover on a summer night with a high powered flashlight trying to talk to extraterrestrials?
Now that you mention it - One was used for that very purpose. In 2002 I think it was, a team called the Mad Scientists created a Ship to Ship communication system whereby people could record a message at a computer controlled kiosk and select where that message should be broadcast.
That message was used to modulate a beam of light to whereever the participant selected. so...yes maybe to talk to ET.

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Old 11-11-2011, 01:32 AM   #31
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Hi, I think you should have your light ready for when ever Doorgunner launches one of his rockets. [Casini / Jackson]
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Old 11-11-2011, 07:21 AM   #32
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Very cool indeed.
Do you have a picture of the ballast? I can't imagine those small honda generators will power this thing if it draws 50+ amps at 120 volts. If it draws that much power it might be around the same KW as a 12 Kw movie light (ARRI Arrisun 120 KIT (12K PAR) Head 562360 - Filmtools) although the light you have is super directional with that PAR reflector.
When using these type of lights make sure not to touch the bare bulb with your hands, the oil on your skin will shorten the life of the bulb (it goes without saying that I'm talking about the cold bulb here:-). Also make sure to keep some sort of UV glass in front, they can literally give you a sunburn and the bulbs can explode. Keep your eyes out for additional bulbs, the bulbs for those 12k film lights above are $2000 (yes, thousand) each!
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Old 11-11-2011, 10:10 AM   #33
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Hey Tim;

is that a flashlight in your pocket, or are you happy to see me?
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Old 11-11-2011, 02:18 PM   #34
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Quote:
Originally Posted by Eric H View Post
Very cool indeed.
Do you have a picture of the ballast? I can't imagine those small honda generators will power this thing if it draws 50+ amps at 120 volts. If it draws that much power it might be around the same KW as a 12 Kw movie light (ARRI Arrisun 120 KIT (12K PAR) Head 562360 - Filmtools) although the light you have is super directional with that PAR reflector.
When using these type of lights make sure not to touch the bare bulb with your hands, the oil on your skin will shorten the life of the bulb (it goes without saying that I'm talking about the cold bulb here:-). Also make sure to keep some sort of UV glass in front, they can literally give you a sunburn and the bulbs can explode. Keep your eyes out for additional bulbs, the bulbs for those 12k film lights above are $2000 (yes, thousand) each!
For all the rest of us geeks, here are the specs of the light. It is a 1kw short arc xenon bulb.
It is powered by 28 volts D.C. at about 58 amps. So 1 EU2000 can power it, but it will require a 28 volt power supply. Now, 2 deep cycle batteries will do the trick giving about 30-45 minutes of run time. I am opting to go with 4 Trojan T-105 batteries for longer capacity. I might be able to get a cheap welder to act as a charger or maybe I can get lucky and pick up a 28 volt surplus telephone system power supply that will output 100 amps if needed.

I will have to pop off the heat exchanger off the back of the light to get a picture of the ballast. But until that time, here is links to the 2 technical manuals on the light that I have been able to find.

Hey DG,

We do need to set up a launch - I'll bring the light to Casini just in case.

www.liberatedmanuals.com/TM-11-5855-250-12-and-P.pdf

http://www.liberatedmanuals.com/TM-11-5855-217-35.pdf
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Old 11-11-2011, 02:56 PM   #35
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Buttercup, That is cool.

I'm always thinking of fabricating a full length housing that would streamline the roof top A/C units on my moho, while containing integrated awnings and top mounted solar panels. I've looked into surplus small airplane engine cowlings that would form the forward facing surface. Some sort of crazy headlight would be fitted into the space vacated by the propeller. Check out images of 1930's/40's streamlined trains. That light of yours would sure do the trick out on a dark interstate!
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Old 11-11-2011, 03:37 PM   #36
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Quote:
Originally Posted by Gringo View Post
hey did anyone else ever lay in a field of clover on a summer night with a high powered flashlight trying to talk to extraterrestrials?
I did it as a tenderfoot scout in the San Gabriels. That and chase snipes...

Good Times!

Happy snipe hunt... oops, I mean Airstreaming!

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Old 11-11-2011, 04:16 PM   #37
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Heck, I'm 61 years old and I still play in the sand at the beach.
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Old 11-11-2011, 04:49 PM   #38
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next year's camping trip?

that thing would give a whole new meaning to BURNING MAN!
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Old 11-11-2011, 08:09 PM   #39
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If it's a 1 KW bulb it will only draw between 10 and 20 amps tops...
SEE HERE: Convert 1 KiloWatt to Amperes
I think you have the amps wrong, 58 amps is about 1/4 of what comes into most houses, that's why it takes that much to power a 12K (which will make nighttime daytime:-)
Take a look, it takes two of the honda generators to make 30 amps (at 120)..
Reliance 30 Amp RV Parallel Kit for Honda EU2000i, Model# HPK2011 | Generator Accessories | Northern Tool + Equipment
This is something my crew struggles with day in and day out during location shooting... one 20 amp circuit will just handle a 2KW light (tungstan, so ACTUAL 2000 watt draw).
So you're batteries might power the light you have, but your batteries are not even close to 58 amps...which is a fun and dangerous amount of of amps.
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Old 11-11-2011, 08:56 PM   #40
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I guess it could be really useful if you wanted to weld the trunk shut on that slowpoke in front of you...
I can think of a lot of uses for that light, some of them may even be legal and kosher. For one, you could light up the bedroom of your neighbor's house. And yes, I know it's 3 miles away.
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Old 11-11-2011, 08:59 PM   #41
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Won't that thing push a starship if you point it backwards?


I guess you could jacklight deer without firing a shot. Medium rare.
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Old 11-11-2011, 11:48 PM   #42
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No, I don't have the amperage wrong at all. A short arc tube like this will draw far more current if given the opportunity. But the ballast ensures that it draws just enough to sustain the arc. Short arc bulbs are unlike incandescent lamps who's resistance goes up as the element heats up. Once ignited, a short arc bulb will draw current easily as it has such a low impedance.
So, the current to the bulb is clamped to prevent a runaway as it were. Also, 28 volts at 58 amps (or was it 52 amps, I don't remember exactly but it is in the tech manual I linked earlier) is not the bulb current, but the total current of the entire lamp assembly which includes cooling blowers and the igniter circuit and whatnot. The bulb alone should draw somewhere in the vicinity of about 35 amps if the supplied voltage to it is indeed 28 volts. The rest is overhead.
Now, with a series bank of batteries and an appropriate charger and with intermittent use, one EU2000 could power the whole thing. I classify intermittent as perhaps a 50% duty cycle for the lamp - 15 minutes on, 15 minutes off. When the lamp is off, the cooling blowers still operate but they are only a few amps, allowing the generator to recharge the batteries. I calculated the total DC draw at approx 1670 watts, which is within the continuous capability of an EU2000.
The batteries - when and if I get them, are capable of a 75 amp draw for up to 115 minutes - of course, at that draw without charging, the overall supplied voltage of the battery bank will likely drop below the minimum required voltage specified for the lamp which is 22 volts.

Quote:
Originally Posted by Eric H View Post
If it's a 1 KW bulb it will only draw between 10 and 20 amps tops...
SEE HERE: Convert 1 KiloWatt to Amperes
I think you have the amps wrong, 58 amps is about 1/4 of what comes into most houses, that's why it takes that much to power a 12K (which will make nighttime daytime:-)
Take a look, it takes two of the honda generators to make 30 amps (at 120)..
Reliance 30 Amp RV Parallel Kit for Honda EU2000i, Model# HPK2011 | Generator Accessories | Northern Tool + Equipment
This is something my crew struggles with day in and day out during location shooting... one 20 amp circuit will just handle a 2KW light (tungstan, so ACTUAL 2000 watt draw).
So you're batteries might power the light you have, but your batteries are not even close to 58 amps...which is a fun and dangerous amount of of amps.
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