Eiko brand 50 Watt halogen capsules. JC type, 12 volts for low voltage systems. Low voltage means a smaller fillament, for greater optical control.
DOUBLE CHECK the distance separating the two pins on your existing lamp. They come in different sizes and if the pins do not match up correctly, the capsule will not fit properly. Distance between pin tips for this version is 6.35mm (0.25")
NOT for general purpose lighting. Filament design provides extremely high intensity, very bright white light, rated for 50 hours life. Often used in scientific and photopraphic applications.