This document specifies requirements for category H₁₀ LED light sources with PY20d caps. The light source shall not exceed the outlined envelope and shall function in either voltage polarity. Essential characteristics include rated values of 12 volts and 21 watts, with luminous flux of 1500 lm minimum at test voltage. The luminous flux measured at elevated ambient air temperature shall be at least 75% of objective luminous flux. Screen projection requirements define light-emitting area positioning using box systems. Normalized luminous intensity distribution requirements are specified in C-planes with defined test points and minimum/maximum intensity values in cd/klm.