Wavelength of Light

http://en.wikipedia.org/wiki/Light-emitting_diode

Cheers for the help lads
It was a more specific problem |I had than one google will answer

http://motion.kodak.com/motion/uploadedFiles/US_plugins_acrobat_en_motion_newsletters_filmEss_03_Nature-of-Light.pdf

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If it was a more specific problem, then a more specific question may have helped

Will explain fully if anyoner responds!
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So ...........

You mean relationship between wavelenght and colour of light?

There can be no light without darkness

And Yawheh said, 'let there be light...and there was light'.

Visible light is made up of the colours like we see in a rainbow. You can remember the colours using the acronym ROYGBIV, red-orange-yellow-green-blue-indigo-violet. Different colours have different wavelengths with red having a longest wavelength and violet having the shortest wavelength. Beyond visible light there is ultra-violet to x-rays with very short wavelengths and radio waves and microwaves with longer wavelengths. If you know a frequency, you can determine the wavelength by dividing 1 by the frequency e.g. 1/freq. That is all I know.

What was your specific problem? FYI i have an electronics hons degree.