Eiko brand MR16 halogen special purpose lamp. 150 Watts for more power and light. 20 volts for low voltage systems. Low voltage means a smaller fillament, for greater optical control.
Halogen lights provide brighter, whiter light than incandescents, while maintaining outstanding color rendering
Dichroic reflector reflects visible light out the front while letting heat escape out the back, resulting in a cool beam of light
NOTE - this is not a general purpose lamp. Light output is greater and color is brighter than equivalent halogen lamps, but rated life is only 500 hours. Generally used in photgraphic or scientific applications.
NO LENS - enclosed fixture recommended