medium-pressure mercury lamp

Non-coherent radiation source containing mercury vapour at pressures ranging from $50$ to several hundred $kPa$ ( $1 atm = 101.325 kPa$ ). Emits mostly from $200$ to $1000 nm$ with the most intense lines approximately at $218$ , $248$ , $254$ , $266$ , $280$ , $289$ , $297$ , $303$ , $313$ , $334$ , $366$ , $406$ , $408$ , $436$ , $546$ and $578 nm$ .

Source:

PAC, 2007, 79, 293 (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 369

medium-pressure mercury lamp

Also contains definition of: medium-pressure mercury arc