About our T8 tube, have 4 length (600mm 900mm 1200mm 1500mm)with 9W to 30W can choose. T5 tube have 2 length (600mm 900mm 1200mm )with 9w & 20w available . T8 & T5 tube use TOP SMD LED 3528 &3014 inside and we made this 3528&3014 in our own factory& the lamps shell also made in house, so we can control many things about tube light and offer the more cheaper price than other producers. hope you can buy one sample for test the quality. About the power suply we all use high qulity get the UL CE Rohs etc approved. 32pcs/carton.