  500W bulb filament. 
This is a light bulb filament from a 500W photo lamp of a type we no longer use since upgrading to 85W compact fluorescent bulbs which run much cooler. 
Source: nick 
Contributor: Theodore Gray 
Acquired: 8 February, 2009 
Text Updated: 8 February, 2009 
Price: Donated 
Size: 1" 
Purity: 99%
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