The Hi-Tech Lamps part number EFP-U is a 100 watt (100W) 12 volt (12V), MR16 reflector halogen lamp made by Ushio. This halogen lamp has an overall length of 42mm and a diameter of 50mm. It has a specular reflector, a C-6 transverse filament and a GZ6.35 base. It has an average lifetime of 50 hours, a color temperature of 3400 Kelvin (3400K) and has a 32mm working distance (focal point). This lamp is also known as Ushio EFP, JCR12V-100W and 1000271.