Lighted number boards available?

I've made number boards when I didn't have them.  My technique...

• Print the number board with the correct font and letter size on standard 20# white paper in reverse, black background, white numbers.  I use Microsoft Word.
• Cut out a clear piece of plastic to fit the number board opening if you don't already have one.
• Using canopy glue (Tester's Clear Parts Cement) stick the number board lettering on the plastic backing.
• Spray a coat or two of clearcoat on the number board.
• Install the number board in the opening, also with the same canopy glue.

John..thanks for the tip.. I'll try that