The Hi-Tech Lamps part number G4T5-O is a 4 watt (4W) UVC germicidal lamp made by Osram. This lamp has maximum overall length of 5.91in. It is a T5 bulb with a G5 miniature bi-pin base. The average rated lifetime of this lamp is 6000 hours. This lamp is also known as Osram G4T5/OF and 23397.