Features: 1) Model: BLB 2) Wattage Avaiable: 4W - 40W 3) Dimension: diameter 16-26mm, length range: 135.9mm - 1199mm 4) Lamp base: G5 or G13 5) No flash, extremely long life 3000-5000hrs Applications: Kill germs Medical Treatment,It can be used for disinfection in the fields of medicine, bacteria study, pharmaceutical, photochemical reaction, and air cleaning etc.