Re: Question on flash and power or intensity measurement.

[Jan Faul <jan@xxxxxxxxxxx>]

And then try a book called Secrets of Studio Still Life by Perweiler. It is at Amazon. Take a peek at The Easy Expert by Morton Marsh (1978) to see color shots made with a 200Watt tungsten bulb by both Faul guys.

On Oct 19, 2013, at 3:46 PM, Randy Little wrote:

Joseph Try a book called Light Science and Magic.  

Randy S. Little
http://www.rslittle.com/

http://www.imdb.com/name/nm2325729/

On Fri, Oct 18, 2013 at 10:14 PM, Joseph Chamberlain <drjchamberlain@xxxxxxxxx> wrote:

Hi, everyone.

I need help with a question I have that relates to flash units and studio lighting.

My specific project requires that I use static lights (if possible) in place of strobes or flash units (on or off camera). I am trying to replace the flash units I now use with static lights that will provide the same amount of light.

My question:

1. How can I calculate and convert the amount of light emitted by a flash unit based on its guide number ? Lights are usually measured in Watts, Lumens, Candles and other units. How can I calculate this value (or values) for my flash unit so that I can buy studio static lights that produce the same degree of illumination ?

Thank you all in advance for your help.

Joseph.

PS: Any recommendation of book titles that cover this subject (the mathematics of flash and studio lighting calculation) will be very appreciated.

Art Faul

The Artist Formerly Known as Prints

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