The electric lamp comprises a discharge vessel ( 1 ) which has pinched seals ( 4 ) of H-shaped cross-section. A pair of metal mounting members ( 10 ) are clicked on each pinched seal ( 4 ) to allow the lamp to be mounted in a tubular quartz glass sleeve. The lamp may be used to sterilize a liquid which is made to flow past the glass sleeve. The lamp can be easily mounted into and removed from the glass sleeve.
