Two photocell controlled lighting system employing filters for the two photocells that control on/off operation for the system

A cordless lighting system for a decorative tree, comprising:

• a control transmitter for generating light signals of first and second frequencies;
• a plurality of light elements, each of the light elements comprising:
• a light source for generating visible light of the first frequency;
• a battery for supplying power to activate the light source;
• a bistable switch having an input, and an output connected to the light source;
• first and second photocells, each photocell having a colored lens such that the lens of the first photocell causes the first photocell to respond to light signals of the first frequency and the lens of the second photocell causes the second photocell to respond to light Signals of the second frequency, thereby generating first and second control signals to the input of the bistable switch, wherein the first control signal controls the bistable switch to activate the light source for generating visible light of the first frequency and the second control signal controls the bistable switch to deactivate the light source;
• and
• a plurality of clamps, each of the clamps for attaching a light element to the tree;
• wherein upon activation of the light source of a first light element, light of the first frequency is received by the first photocell of a second light element to thereby activate the light source of the second light element such that the first and second light elements are lit in a cascaded manner.