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Thread: light frequency in AUS

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    light frequency in AUS

    Hi,

    I was reading this post http://www.dpreview.com/forums/thread/3499860 in regard of light frequency and shutter speed.
    Do you know what is the frequency of florescent light in Australia?

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    The frequency is the same as the power supply which is 50 Htz.
    Which means 50 cycles per second.
    Cheers
    Darey

    Nikon user, Thick skinned and wanting to improve, genuine C & C welcomed.

    Photographs don't lie ! - Anonymous Liar

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    Quote Originally Posted by Darey View Post
    The frequency is the same as the power supply which is 50 Htz.
    Which means 50 cycles per second.
    Not always as it depends on the ballast used, but normal inductive ballasts work at mains, ie 50Hz.

    Electronic ballasts are fairly common and can run at very high frequency so there is no flicker at all.
    Last edited by jjphoto; 09-06-2013 at 10:08pm.

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    Professional fluorescent lights do have electronic ballasts and put out around 25Khz- 25000 cycles per second so they wouldnt worry you even if you were shooting 1000fps film.
    Your run of the mill office flouro generally does 50hz, if you are shooting at 1/50th or 100/th you should not have any exposure problems. 1/200th becomes potentially problematic.
    Looking (briefly) at that thread, if you are worried about wb variations- use a flash to cover the foreground, shoot raw (why would you do anything else?) and you can twist out the tubes directly affecting your subject if you have to.
    Togs are what my son wears to go swimming.

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