This document defines category HIR2 LED light source specifications. The LED light source shall not exceed the envelope indicated in Figure 2, be concentric to the reference axis, and function in either voltage polarity. Essential characteristics include rated values at 12 volts DC of 26 watts power and 2000 lm minimum luminous flux. Cap temperature shall not exceed 63°C at test voltage or 100°C at elevated ambient air temperature. Luminous flux measured at elevated ambient air temperature shall be at least 75% of objective luminous flux. Light emitted shall be white. The contrast proportion of luminous flux shall be 100 minimum. Normalized luminous intensity distribution shall comply with specified limits in C-planes.