WAcuity Brands
WAnglepoise lamp
WAppleton spotlight
WAputure
WArtcraft Fluorescent Lighting Corporation
WArtemide
WClay Paky
WJ. B. Colt Company
WEdison and Swan Electric Light Company
WFinally (company)
WGE Lighting
WGeneral Electric
WHelios AG
WHolophane
WIKEA
WKliegl Brothers Universal Electric Stage Lighting Company
WLamps Plus
WLouis Poulsen
WMaglite
WMathmos
WMazda (light bulb)
WMusco Lighting
WOpple Lighting
WPairpoint Glass
WPanasonic
WPetromax
WPH Artichoke
WPH-lamp
WPhilips
WR. E. Dietz Company
WRexel
WSureFire
WSvetlina AD
WThomas Research Products
WThorn Lighting
WTilley lamp
WTrilux
WTungsram