The Kyouei Balloon Lamp is a self-powered, self-contained lantern that can be strung along in lines for a Japanese hanging lamp effect or grouped together for a clustered cloud look. The ambient lamps are made from a simple balloon affixed to a long lasting LED. The light is powered by lithium coin batteries so there is no need to connect the lamp to a grounded power supply.

The lamp costs 2940 Yen ($25/£12) from here.