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Intentional flourescent flicker


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#1 Jesse Lee Cairnie

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Posted 19 November 2009 - 12:55 PM

Is there any way to achieve this effect outside of buying used fixtures with bad ballasts?
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#2 David Mullen ASC

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Posted 19 November 2009 - 01:03 PM

Is there any way to achieve this effect outside of buying used fixtures with bad ballasts?


You can try putting an ordinary shoplight on a dimmer or flicker box -- that works pretty well until you fry the ballast...
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#3 Evan Pierre

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Posted 19 November 2009 - 01:46 PM

CFL's will also give you gnarly flicker if dimmed.
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#4 Ryan Thomas

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Posted 20 November 2009 - 05:03 AM

That's what I thought, but I tried that on a shoot the other day and it just turned off after I dimmed it down past a certain point. I wish I knew what I was doing wrong.

Edited by Ryan Thomas, 20 November 2009 - 05:03 AM.

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#5 John Sprung

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Posted 20 November 2009 - 03:43 PM

The emergency shoot day fix is to have a guy sit there with the plug and nervously interrupt the power. Flourescents draw very little current, so you're not going to arc and fry a prong.




-- J.S.
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#6 Jesse Lee Cairnie

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Posted 23 November 2009 - 12:27 AM

Thank you, I will experiment with Shop fixtures on dimmers... I was under the impression that if fluorescent doesn't have exactly 110/20v they would shut down..

none the less I will give it a try and see.. and I will pick up a couple bad ballast fixtures too and compare the two..

Cheers!
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#7 Adrian Sierkowski

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Posted 23 November 2009 - 06:49 AM

I recall on a set I had bought these $9 shop fixtures from Home Depot. They worked great, no flicker at all, until we had a longer cable run (and voltage drop) when they flickered on and off like mad. Worked perfectly for the shot and what they were doing, and they still work to this day. If memory serves, the line was down 'round 90V.
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#8 Mark Wherley

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Posted 23 November 2009 - 03:39 PM

That's what I thought, but I tried that on a shoot the other day and it just turned off after I dimmed it down past a certain point. I wish I knew what I was doing wrong.


The range to dim CF is extremely narrow. If you simply slide the dimmer back and forth it will just switch the light off at some point. Instead try sliding or turning the dimmer knob very slowly. At the point it switches off tap the slider (or slowly turn the dimmer knob) in the opposite direction. You should get a flicker.
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#9 Daniel Russel

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Posted 27 November 2009 - 07:00 AM

I've used this unit before and it was the biz....
In London, I believe Cirrolite used to stock it but seems pretty rare... Don't know about rest of the world.

http://www.movie-int...ucts/index.html


Cheers!
Dani
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Broadcast Solutions Inc

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Technodolly

Metropolis Post

Gamma Ray Digital Inc

Glidecam