low-pressure mercury lamp (arc)

https://doi.org/10.1351/goldbook.L03637
Resonance lamp
that contains mercury vapour at pressures of about 0.1 Pa (0.75×103 Torr; 1 Torr=133.33 Pa). At 25 C, such a
lamp
emits mainly at 253.7 and 184.9 nm. They are also called germicidal lamps. There are cold- and hot-
cathode
as well as cooled electrode-less (excited by microwaves) low-pressure mercury lamps. The
Wood lamp
is a low-pressure mercury arc with an added fluorescent layer that emits in the UV-A spectral region (315-400 nm).
Source:
PAC, 2007, 79, 293. (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 358 [Terms] [Paper]