LOW-PRESSURE MERCURY VAPOUR DISCHARGE LAMP

摘要

A low-pressure mercury vapor discharge lamp having a very satisfactory color rendition (R(a,8)>/=85) and having a color temperature of at least 3200 K. and a color point located on or near the Planckian locus. The lamp is provided with a luminescent layer comprising: a. a luminescent alkaline earth metal halophosphate activated by Sb3+ or by Sb3+ and Mn2+ b. a luminescent material activated by Eu2+ and having an emission maximum at 470-500 nm and a half-width value of at most 90 nm and c. a luminescent rare earth metal metaborate activated by Ce3+ and Mn2+ and having a fundamental lattice Ln(Mg,Zn,Cd)B5O10, where Ln represents the elements Y, La and/or Gd, which borate has a red Mn2+ emission.