Ceiling light contains a pull cord generator system which can light up for 5 minutes from 3 pulls of dynamo. It is a human-powered product. The idea suggests way of practicing sustainable energy consumption. "X" expresses the amount of energy that can be generated and "+" expresses the principle of applying human muscular energy to operate the device. The project received 16,000 GBP from European Regional Development Fund as Innovation Fellowship programme for commecialisation.