Luxon Gessé
Luxon may refer to: * An obsolete synonym for the troland, a unit of conventional retinal illuminance * Luxon or a massless particle, a particle traveling at the speed of light * Benjamin Luxon (born 1937), British baritone * Christopher Luxon Christopher Mark Luxon (born 19 July 1970) is a New Zealand politician and former business executive who is currently serving as leader of the New Zealand National Party and the Leader of the Opposition. He has been the Member of Parliament (M ...

Troland
The troland (symbol Td), named after Leonard T. Troland, is a unit of ''conventional retinal illuminance''. It is meant as a method for correcting photometric measurements of luminance values impinging on the human eye by scaling them by the effective pupil size. It is equal to retinal illuminance produced by a surface whose luminance is one nit when the apparent area of the entrance pupil of the eye is 1 square millimeter. The troland unit was proposed in 1916 by Leonard T. Troland, who called it a photon. The troland typically refers to the ordinary or photopic troland, which is defined in terms of the photopic luminance: : \mathrm = \mathrm \times \mathrm , where ''L'' is the photopic luminance in cd m−2 and ''p'' is pupil area in mm2. A scotopic troland is also sometimes defined: : \mathrm = \mathrm \times \mathrm , where ''L′'' is the scotopic luminance in cd m−2 and ''p'' is pupil area in mm2. Although named "retinal illuminance" (and originally named "p ...
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Massless Particle
In particle physics, a massless particle is an elementary particle whose invariant mass is zero. There are two known gauge boson massless particles: the photon (carrier of electromagnetism) and the gluon (carrier of the strong force). However, gluons are never observed as free particles, since they are confined within hadrons. In addition the Weyl semimetal or Weyl fermion discovered in 2015 is also massless. Neutrinos were originally thought to be massless. However, because neutrinos change flavor as they travel, at least two of the types of neutrinos must have mass. The discovery of this phenomenon, known as neutrino oscillation, led to Canadian scientist Arthur B. McDonald and Japanese scientist Takaaki Kajita sharing the 2015 Nobel prize in physics. *Note that although literal Weyl fermions have never been experimentally confirmed to physically exist, certain systems can act collectively such that they seem to contain Weyl fermion quasiparticles. See also *Relativistic ...
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Benjamin Luxon
Benjamin Matthew Luxon (born 24 March 1937, Redruth, Cornwall) is a retired British baritone. Biography He studied with Walther Gruner at the Guildhall School of Music and Drama (while working part-time as a PE teacher in the East End) and established an international reputation as a singer at the age of 21 when he won the third prize at the 1961 ARD International Music Competition in Munich. Soon afterward he joined composer Benjamin Britten's English Opera Group. On their tour of the Soviet Union in 1963, he sang the roles of Sid and Tarquinius in Britten's operas ''Albert Herring'' and ''The Rape of Lucretia'', respectively. In 1971, Britten composed the title role of his television opera ''Owen Wingrave'' specifically for Luxon's voice; Luxon created the role later that year with the English Opera Group. The following year, 1972, Luxon made his début at both the Royal Opera House, Covent Garden – creating the role of the Jester in Peter Maxwell Davies' opera '' Tav ...
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