File:Lightbulb-Telecom.jpg

Note: This image was taken from http://images.google.com/url?q=http://telecom.esa.int/telecom/www/object/index.cfm%3Ffobjectid%3D17065&usg=__LdDISV_ypViea8h-MPibn0CyeGU= under a Creative Commons license. It was found using the Creative Commons search.