These T12 1.5 inch diameter standard tubes have a halophosphate coating to give a standard performance. Typically we supply the following brands: Philips, Osram, Sylvania and General Electric GE. Lengths include 2 foot 20W, 4 foot 40W, 5 foot 65/80W, 6 foot 75/85W and 8 foot 85W, 100W and 125W. 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.