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3D3DLarge krypton bulb.
This is a Sylvania K205PS25 incandescent lamp, said to be filled with krypton, and said to have a lifetime of 12,000 hours, which is huge for an incandescent bulb. It must operate at a very low filament temperature, and thus be extraordinarily inefficient at producing visible light.
Source: eBay seller maxiemumdeals
Contributor: Theodore Gray
Acquired: 8 February, 2009
Text Updated: 8 February, 2009
Price: $3
Size: 6"
Purity: 1%