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Once all LED channels are securely mounted, connect the electrical wires from each LED strip to a suitable LED power supply (transformer). Ensure all connections are properly insulated and secured according to electrical safety standards. Plug in the power supply, preferably to a switch-controlled outlet, and turn on the lights to test the installation. Observe the illumination and ensure all sections light up as intended. The video demonstrates both warm white and cool white lighting, indicating options for different aesthetic preferences, possibly achievable through a color temperature tunable LED strip or different LED strip types.