The Tenebrae service is usually done in Early morning, formerly also at night or Midnight.
It consists of Readings from Scriptures (usually 7, 8, or 15, and even in some churches in ancient times, as many as 12, 24 or 72!). Especially included in the Readings is the Book of Lamentations.
There are as many candles as there are readings plus one ‘Christ Candle’. After each reading, the reader then puts out one of the candles until the service comes to an end.
At the end of the service (After the last reading), the last candle is extinguished and the ‘Christ Candle’ is then either hidden or put out and the whole church is bathed in darkness.
At the end of the Tenebrae either the congregation leaves in silence without speaking or they will beat the pews to make a ‘great noise’ (symbolic of the earthquake after Jesus’ death). The noise-making continues until the Christ Candle is now taken back to the Altar.