I am thinking about building a LED flashlight using an old 2 D battery flashlight case. I did not know what mcd means along with others and wanted to know if some one could point me to a good site that talks all about LED's?

Thanks,
Kyle

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It all started back when I was 3yr old and I put my toung on a 9V.......

 

mcd stands for millicandela. its used to express the intensity of light.

maybe this will help a bit...
http://howstuffworks.lycoszone.com/led.htm