The 4th Day of Kwanzaa
The 4th day of a week long festival celebrating the African American people, their culture and their history.
On the fourth day the black candle is lit, then the farthest left red, the farthest right green. And then the next red candle on the left. This represents the 4th principle of Kwanzaa – Ujamaa (oo-jah-MAH): Collective economics.
source: Kwanzaa on the Net – Seven Days of Celebration