The planet traveler light come from led lighting. This allows travelers to significantly reduce their CO2 emissions. LED lighting is the most economical lighting known. In addition to savings, the life time of a led bulb is 5 times higher than that of conventional bulb, it reduces pollution from the production and recycling of light bulb.
how it works
A light-emitting diode (LED) is a two-lead semiconductor light source. It is a p–n junction diode that emits light when activated.nWhen a suitable current is applied to the leads, electrons are able to recombine with electron holes within the device, releasing energy in the form of photons. This effect is called electroluminescence, and the color of the light (corresponding to the energy of the photon) is determined by the energy band gap of the semiconductor. LEDs are typically small (less than 1 mm2) and integrated optical components may be used to shape the radiation pattern.
Sources : Wikipedia, Lumen Electronic Jewelry