title: A simple light-level recording device to monitor lighting in animal quarters.
abstract: The performance of lighting timers in animal rooms was tested with a portable light-level recorder. The instrument monitored the light and dark phases under various degrees of illumination. This inexpensive method of electronic surveillance ensured the validity of experiments dependent on photoperiodicity.
mesh_terms: D000818:Animals; D006799:Housing, Animal; D008029:Lighting; D010507:Periodicity; D010783:Photometry / Q000295:instrumentation*