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The investigation of nanosecond surface dielectric barrier discharge (nSDBD) at elevated gas pressures is the aim of the work. The hydrodynamic effects and the initiation of combustion of lean H2 : air mixtures (ER=0.5) are studied experimentally. The discharge was studied in different gas mixtures for the pressure range 1–10 bar. The ignition is initiated by two different discharge modes: streamer or filamentary nSDBD. The influence of the discharge structure and the energy deposition on the ignition is demonstrated.