These T5 5/8 inch diameter 21 inch 13W standard tubes have a halophosphate coating to give a standard performance. Colours available are 29 warm white, 35 white, 33 cool white and 54 daylight. Typically we supply the following brands: Philips, Osram, Sylvania and General Electric GE. We advise you to upgrade to a superior quality triphosphor tube where your needs require longer life, higher and better quality ligh output, improved colour rendering CRI Ra and better lumen maintenance.
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