image compression, thermal emission, low temperature, acoustic wave, atmospheric pressure, zeiss, vidar, microspectrophotometer, nerve cell, backscattering, magnetic tape, photomultipliers, pyrometers, block diagram, cadmium sulphide, lens implant, projection screen, wrist watch, audio amplifier, dichroic, third dimension, photochromic, home theater, polarimetry, object recognition, front projector, photomultiplier, x chromosome, spires, pet scanner, diffractive, cold cathode, wide screen, external storage, spectro, maximum likelihood, absorbance, visual perception, photolysis, monochromator, artificial skin, molecular weight, collimating, colorimetry, background noise, optical disk, thermopile, autofluorescence, lightwave, physiol, field emission, spectrophotometry, blueshift, airglow, electroluminescence, revolutionise, photopolymer, spheric, solar radiation, belight, manganite, pentile, vibrometer, electron optics, photometer, aspect ratio, infrared therapy, sensitizer, collinear, strain gauge, reflectometer, collimator, numerical analysis, pathol, luci, input device, spica, permanent magnet, phototransistor, electrophoretic, ferrites, cadmium sulfide, induction heating, imageable, inflammatory disease, strain gage, blackmagic, confocal, transmittance, least squares, photoconductors, magnetic induction, image scanner, ione, photoconductive, ignis, demodulate, composite material, oring, astronomie, digitus, ventilation system

beam, beam of light, candlelight, candle flame, corona, counterglow, daylight, firelight, fluorescence, friar's lantern, gaslight, gegenschein, glow, glowing, half-light, ignis fatuus, incandescence, jack-o'-lantern, lamplight, light beam, luminescence, moon, moonlight, moonshine, radiance, ray, ray of light, shaft, shaft of light, starlight, streamer, sun, sunlight, sunshine, torchlight, twilight, will-o'-the-wisp

electromagnetic spectrum

actinic radiation, actinic ray

light, visible radiation