I know the theory behind it – when an element is heated its electrons can absorb energy and the electron jumps to a higher energy level. When the electron jumps back it emits a photon of a certain colour.

So, how is this related to street lights, advertising signs and lasers?

They are light emitting, which means they give off photons.

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This entry was posted on Saturday, February 28th, 2009 at 12:42 pm and is filed under Advertising. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.