The Ushio part number 1003001, AKA JCR12V-100W/10H is a 12V 100W halogen lamp mounted in an MR16 reflector.  

Specifications

• ANSI Description JCR12V-100W/10H

• Base GZ6.35

• Voltage 12

• Wattage 100

• Burn Position: Base Down to Horizontal

• Refl. Shape: MR16

• Bulb Finish: CLEAR

• Color Temp (K): 3100

• Filament: C-8

• Life (hr): 1000

• MOL (mm): 42.0

• Reflector Size (mm): ø50.7

• Working Distance (mm): 36.0