A look inside some magnetic USB lights.

Some interesting little USB lights with magnets on the back so they can be attached to steel surfaces, or other surfaces if the self adhesive pads are used either directly or with the small steel disks.
They're both of similar construction with a chunky alloy housing and translucent dome with one resistor per LED and an array of 8 LEDs.
The small version has a simple on/off switch, while the bigger version has three intensity levels including the slightly excessive 4.5W mode that causes it to reach temperatures in excess of 60C!

You can find these lights on ebay by searching for USB magnetic LED.

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