Low-pressure mercury vapour discharge lamp

Details Low-pressure mercury vapour discharge lamp Low-pressure mercury vapour discharge lamp

H - Electricity

01

J

313/81

H01J 61/44 (2006.01)

Patent

CA 1210436

-21- ABSTRACT : Low-pressure mercury vapour discharge lamp. A low-pressure mercury vapour discharge lamp having a satisfactory colour rendition (Ra ? 80), a colour temperature of 2800 K or higher and a colour point on or near the Planckian locus. The lamp is provided with a luminescent layer (4) which comprises a. a luminescent rare earth metal metaborate activated by Ce and Mn and having a fundamental lattice Ln(Mg,Zn,Cd)B5O10, where Ln represents the elements Y, La and/or Gd, which borate exhibits red Mn emission, b. a luminescent material activated by Tb3+ and having green Tb3+ emission, c. at least one luminescent halophosphate of the group which comprises the calcium halophosphates emitting white light, activated by Sb3+ and Mn2+ and having a colour temperature of at least 2900 K and blue-lumines- cing calcium halophosphate activated by Sb3+. The lamps yield a satisfactory rendition of deep red colours (R9 ? 60) and have a high luminous flux and a high maintenance of the luminous flux during the life. Fig. 3.

433440

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