  High power xenon studio flash. 
This is a high-power xenon flash tube of the type that I use regularly for photo shoots for my Popular Science column.  They are the most common type used in professional studio flashes. 
Source: Theodore Gray 
Contributor: Theodore Gray 
Acquired: 11 March, 2009 
Text Updated: 12 March, 2009 
Price: Donated 
Size: 4" 
Purity: <5%
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