A compact copper ring with a bright green LED, turned on by a hidden microswitch.
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This uses a 6 volt miniature battery, microswitch and a 120 ohm dropping resistor. The green super high intensity Gallium Indium Nitride LED is rated at 14,000 mcd at 20 mA (= 5 mW) and is dazzling in line with its 15 degree beam. They cost A$10 (in 2002). The green ring microswitch is operated by a thumb press.

 I’ll have mine in platinum please. Darling, it’s…..lovely.

Perhaps this was the inspiration for the Green Lantern and his ring … or maybe not.

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Internal Links related:
3 Color Ring
External:
Green Ring Google+ post:  Dec 18, 2011.
Photo Date: 2002