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People suffering from night blindness seen in a dark environment is not clear, resulting in great fear. This works by people like to hold hope in the dark feeling, do not turn on the lights through the steps to be able to identify the direction in the dark. Can achieve the effect of saving energy saving.
Paper, giving the image of a simple, simple. Pulp and luminous as the combined use as cover. Between the lights and the lights do not produce the same feeling.
The luminous have 10-20 minutes after the absorption of visible light, in the dark night of continuous self-luminous than six hours function.