A method of constructing self-powered air-conditioner comprises a convergent divergent nozzle where powered fan pushes air into said nozzle. In one embodiment, a device can include an outer tube. In a first closed state, the membrane is uncoiled onto the substrate over the port such that light directed at the port impinges on the shutter. The method includes operating the lamp under rated wattage for a period towards the first part of operating life of the lamp.