This document defines essential dimensions, electrical characteristics, and photometrical requirements for LED light source category H9. The LED light source shall not exceed the specified envelope and shall function in either voltage polarity. Rated values include 26 watts at 12 volts and 26 watts minimum at 13.2 volts, with minimum luminous flux of 2000 lm and cap temperature not exceeding 100°C. The luminous flux measured at elevated ambient air temperature shall be at least 75% of objective luminous flux. The document specifies screen projection requirements, contrast requirements, and normalized luminous intensity distribution requirements across defined C-planes and test points.