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blackswan | 13:20 Sun 31st Oct 2010 | Quizzes & Puzzles
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Light sources in which a discharge between two eletrodes produces intense white illumination. 3,5. I think it's -r- lumen, but not sure.Help please.
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27a Arc lamps
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Many thanks,Lie-in-King,I have just realised lumen was wrong,so thanks again,time for lunch.

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