The TEWS panel (along with the rest) are known as a Type 5 edge-lit panel.  Here’s what the “inside” of that looks like.


As you can see, there’s a series of little pockets in the panel for lamps to fit into.  At the “bottom” of each of the holes is a tiny metal reflector.  This helps spread the light throughout the panel and also prevents a “hot-spot” from appearing on the panel face.

Here’s what the circuit board looks like:

As you can see, it’s REALLY simple.  The bulbs are very, very small.  They stand about 1/8″ above the surface of the board and are a bit less than that in diameter.  The metal part in the center of the board is the PCB side of the coaxial connector that provides +5V to the board.  This board will draw just under 1.5A at full illumination.  Incandescents are HUNGRY little beasties!



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