WordNet (r) 3.0 (2006):

light source
    n 1: any device serving as a source of illumination; "he stopped
         the car and turned off the lights" [syn: light, light
         source]

Moby Thesaurus II by Grady Ward, 1.0:

77 Moby Thesaurus words for "light source":
   Chinese lantern, Finsen light, Moore light, arc light,
   battery lamp, benzine, broadside, candle, candlelight, coal oil,
   cresset, dark lantern, electric candle, electric lamp,
   electric torch, electric-arc lamp, electric-discharge lamp,
   electricity, filament lamp, flame lamp, flash lamp, flashbulb,
   flasher, flashgun, flashlight, flood lamp, floodlight, floor lamp,
   focus lamp, gas, gas lamp, gaslight, gasoline, head lamp,
   headlight, high-intensity lamp, illuminant, illuminating gas,
   infrared lamp, kerosene, klieg light, lampion, lamplet, lantern,
   light bulb, limelight, luminant, magic lantern, magnetite arc lamp,
   mercury lamp, mercury-arc lamp, moderator lamp, navigation light,
   neon light, neon tube, night light, oil, oil lamp, osmium lamp,
   paraffin, petrol, petroleum, photoflash lamp, pilot light,
   rushlight, safety lamp, searchlight, sidelight, spot, spotlight,
   stop light, strobe, strobotron, sun lamp, sun spot, table lamp,
   torch