title: Light intensity measurement; characteristics of light sources; filters and monochromators.
mesh_terms: D000186:Actinium; D005069:Evaluation Studies as Topic; D007259:Infrared Rays; D007834:Lasers; D008027:Light; D008628:Mercury; D008722:Methods; D010783:Photometry; D012822:Silicon Dioxide; D013053:Spectrophotometry; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D013816:Thermodynamics; D014414:Tungsten; D014466:Ultraviolet Rays
chemical_list: D012822:Silicon Dioxide; D008628:Mercury; D000186:Actinium; D014414:Tungsten