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Author Topic: Lightning effect outdoors, in daylight  (Read 3148 times)

James Feenstra

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Re: Lightning effect outdoors, in daylight
« Reply #10 on: June 02, 2017, 07:18:00 pm »

While the thought of a 250KW strobe is intriguieng, I don't think it's realistic to rent this for a payable price in Norway...

On a related note: It would be fun to see the technical spec sheet for a small thermonuclear device used as stage pyrotechnics... ;)
Nothing like a strobe that requires it's own 400a service
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Jason Tubbs

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Re: Lightning effect outdoors, in daylight
« Reply #11 on: June 02, 2017, 08:44:18 pm »

How about having a guy hold up a cardboard sign that says LIGHTNING!! on it at the right moments?  :)


https://www.youtube.com/watch?v=j_ekugPKqFw
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David Buckley

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Re: Lightning effect outdoors, in daylight
« Reply #12 on: June 05, 2017, 05:16:33 pm »

While the thought of a 250KW strobe is intriguieng, I don't think it's realistic to rent this for a payable price in Norway...

Ah yes, that might be problemsome; I'm a bit outr of the way myself (New Zealand), and by and large assume most Lab users are US based...

OK, we cant do a big strobe.  Hmmmmm.  I'm old.  Old enough to remember a time before electronic flashguns for photography were affordable, and before these we had flashbulbs, which I remember well.  Flashbulbs were merely a convenient repackaging of a technique used from earliest days of photography, the magnesium flash powder lamp.  Perhaps a variation of this could be used to deliver the goods?  Not the safest technique in the world, but with attention to risk management, possible to do adequately safely.

Demo of an old powder flash:

https://www.youtube.com/watch?v=Re8YZcLHH-A

Nothing like a strobe that requires it's own 400a service

:)

I seem to recall reading somewhere that these things can be run off a genset, but the genset won't like it, so has to be effectively dedicated to the strobe, and be of adequately rated power.
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David Allred

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Re: Lightning effect outdoors, in daylight
« Reply #13 on: June 06, 2017, 08:47:39 am »

Ah yes, that might be problemsome; I'm a bit outr of the way myself (New Zealand), and by and large assume most Lab users are US based...

OK, we cant do a big strobe.  Hmmmmm.  I'm old.  Old enough to remember a time before electronic flashguns for photography were affordable, and before these we had flashbulbs, which I remember well.  Flashbulbs were merely a convenient repackaging of a technique used from earliest days of photography, the magnesium flash powder lamp.  Perhaps a variation of this could be used to deliver the goods?  Not the safest technique in the world, but with attention to risk management, possible to do adequately safely.

Demo of an old powder flash:

https://www.youtube.com/watch?v=Re8YZcLHH-A

:)

I seem to recall reading somewhere that these things can be run off a genset, but the genset won't like it, so has to be effectively dedicated to the strobe, and be of adequately rated power.

Would be hard to get the timing (cue) and delivery method down, but the key to a magnesium fire is the water.
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John Fruits

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Re: Lightning effect outdoors, in daylight
« Reply #14 on: June 06, 2017, 11:26:10 am »

There was an early electrical lightning effect which consisted of a carbon arc device connected to a solenoid. 
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David Buckley

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Re: Lightning effect outdoors, in daylight
« Reply #15 on: June 06, 2017, 09:16:31 pm »

I've read about the old carbon arc lightning thing but never seen one.

I do have some experience with carbon arc lamps though, mainly as light sources in cinemas. And have stood next to a variety of world war two era searchlights powered by carbon arcs.   Its fun stuff, but even the biggest arc lamps I've seen were a couple of tens of KW.

So whereas the carbon arc lightning simulator may have been the business a goodly few decades ago, I doubt it would be in the least impressive compared to a couple of Atomics.  And sadly, for this application, a couple of Atomics versus the sun is a lost battle...


As an aside: The first theatre followspots I ever saw live were carbon arc searchlights, back in the early 60s.   Searchlights just like this one, rated at 2.5KW, though without the generator!



Image from the waaaaaayback machine.
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