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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