Electromagnetic radiation with a range of wavelength between about 390 nm (violet) and 770 nm (red), capable of stimulating the subjective sensation of sight; sometimes considered to include ultraviolet and infrared radiation as well.
- l. beam diaphragm — adjustable lead shutters at the aperture of an x-ray tube. Usually includes a light bulb which delimits the area covered by the beam at the cassette level.
- l. cattle — store class cattle off range and destined for movement onto irrigated pasture or into feedlot for fattening.
- l.–dark cycles — an important environmental factor in proper housing of laboratory animals for optimal health and reproductive cycling. Most species do well on a 12:12 light–dark cycle but in rabbits more light for females and less for males is recommended.
- polarized l. — light of which the vibrations are made over one plane or in circles or ellipses.
- l. sensitization — see photosensitization.
- l. sheep — sheep light in condition off subsistence range and destined to go to irrigated pasture or into a feedlot for fattening.
- l. stimulus — see electroretinograph.
- Wood's l. — see wood's light.
