A variable-effect lighting system includes a lamp assembly and a lampcontroller coupled to the lamp assembly. The lamp assembly comprises a numberof multi-coloured lamps in series with an AC voltage source and in series witheach other. Each multi-coloured lamp comprises a first illuminating elementfor producing a first colour of light, and a second illuminating element forproducing a second colour of light. The lamp controller is configured to varythe colour produced by the lamps by varying the conduction interval of eachilluminating element according to a predetermined pattern. The controller isalso configured to terminate the variation upon activation of a user-operableinput to the controller.
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