Bright idea...

The most prolific inventor of all time, Thomas Edison is probably best known for his invention of the incandescent light bulb. And his developments resulted in over 1,000 patents during his lifetime. The Krone pen company is paying tribute to Edison with its newest limited edition, the Thomas Edison collection.
 
The Italian resin from which the cap is made is shaded from dark to light and houses a functioning light bulb. Edison’s distinctive autograph decorates the sterling silver cap band, and the barrel, which features a hand-painted portrait of Edison, is embellished with a gilded light in gold leaf. The pen’s blind cap is reminiscent of the base of a light bulb (WARNING...this is for decorative purposes only...do not plug your pen or any part of it into any electrical source...injury may result and then you will feel really silly).
 
The Thomas Edison is available in a worldwide limited edition of 388 piston-filled fountain pens, each with an 18-karat nib available in fine, medium or broad sizes, and 38 rollerballs. The fountain pen is priced at $5,900, and the rollerball, $5,700.
 
Thomas EdisonTM Licensed by The Charles Edison Fund, Represented by GreenLight.