high-pressure mercury lamp (arc)

Radiation source containing mercury at a pressure of ca. $8 MPa$ (ca. $80 bar$ ) or higher which emits lines over a background continuum between about $200$ and $1400 nm$ .

See: lamp

Source:

PAC, 1996, 68, 2223 (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2246