ASA scale British candle Hefner candle Kern NMR Scheiner scale X ray actinic ray actinism alpha particle antibaryon antilepton antimeson atomerg atomic beam atomic nucleus atomic particle atomic ray baryon beam beam of light beta particle bougie decimale calorie candle candle lumen candle power candle-foot candle-hour candle-meter decimal candle dinamode dyne electron elementary particle energid erg exposure meter flux foot-candle foot-pound gamma ray gleam horsepower-hour horsepower-year infrared ray intensity international candle invisible radiation joule kilogram-meter kilowatt-hour lamp-hour leam lepton light light meter light quantum lumen lumen meter lumen-hour lumeter luminous flux luminous intensity luminous power lux meson neutron nuclear force nuclear magnetic resonance nuclear particle nuclear resonance nucleon nucleosynthesis nucleus patch pencil proton quantum radiation radiorays ray ray of light ribbon ribbon of light solar rays strangeness streak stream stream of light streamer strong interaction triton ultraviolet ray unit of flux unit of light valence electron violet ray