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Fluorescent-lamp formats - Wikipedia
![21" 13W T5 Fluorescent Tube 535 [3500k] Standard White (Crompton) : Amazon.co.uk: Lighting](https://m.media-amazon.com/images/I/21auVvWJXkL._AC_UF894,1000_QL80_.jpg "21\" 13W T5 Fluorescent Tube 535 [3500k] Standard White (Crompton) : Amazon.co.uk: Lighting")
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