From peri (around) and lampō (to shine). To shine around, to illuminate from all sides. Used of the heavenly light at Jesus' birth announcement and Paul's conversion.
The glory of the Lord 'shone around' the shepherds at the birth announcement (Luke 2:9), and a light from heaven 'shone around' Paul on the Damascus road (Acts 26:13). In both cases, divine light invaded darkness to deliver a life-changing message. God breaks into human darkness with blinding revelation.