The Hi-Tech Lamps part number 64333B-O is a 40 watt (40W) current controlled halogen lamp made by Osram. It is intened to operate on a circuit providing a stable 6.6 amp current (6.6A). This lamp has a maximum overall length of 37mm. It is a MR11 bulb with female round connectors. The average rated lifetime of this lamp is 1500 hours. This lamp is also known as Osram 6.6A/40MR11/64333B and 58889.