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Re: [TCML] discharge lumins

On 3/10/12 12:28 PM, Simon H. wrote:
Does anyone know if there is a relationship between power input, power
output, or frequency of the coil vs how many lumins are being

The more power the brighter (e.g. more lumens)..
I don't know that there is a reliable equation to relate the two, though. There's an awful lot of factors that go into how many, how big, and how bright the sparks are, besides electrical power.

  Is there a good way to accuratly measure the lumins to
find the maximum output if there is a relationship?

Yes. a photographic spot meter would be a good way to measure average intensity. Film has a very consistent exposure to negative density curve, so if you know the exposure time and the "blackness" of the negative, you can calculate the luminous intensity of the spark. You'd need to calibrate your lens setup, and perhaps also deal with the "short duration of spark" issue... some sparks are short enough in duration that reciprocity failure is an issue.

Video recording or other solid state cameras are also possible, with calibration.

Also, Ive seen toroid sparks with different colors.  Some light blue,
darker blue, white, and redish  (with a salt additive i believe).

Yes, blue, purple, etc. are most common from the ionized air.

read some of that is due to tuning, true?  Would there be a way to
measure the wavelength in nanometers to see just what range
 in the
color spectrum i'm in?

A spectroscope will do nicely. There are inexpensive ($40-50?) diffraction grating based spectroscopes out there that would probably work for you.

Any comments are welcome, thank you.

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