You have to figure out where you want your text, so you'll need a correct UV-map of you plane and save that as a template, this can be done with a program like UV-mapper. Don't make it too small (2000², or 3000²)

Load the UV-template in a photshop, or paintshop, the gimp or whatever and made some white on black text, and save it as a jpg or bmp file with an appropiate name. if you save it as a jpg-file don't use compression or as little as neccesary.

give your plane a glass shader, for example one of the standard ones in the materialroom.

give the ambient_color channel a color, right or green or what you like, set the ambient_value to 1 or higher and attach an imagemap with you textpicture to the ambient_value.

when you render it, the letters are projected to the glass and glow, even without lights.

good luck!

Bopper.

Double post with Ockam, but now you have different options!
Two for the price of one.

 

-How can you improve things when you don't make mistakes?