Light bulbs being used to spy on conversations

In a startling new cybersecurity development, LED bulbs are being used to tap into conversations up to 100 feet away. As a ‘passive attack’ method, this hack involves recovering sound by analysing ‘optical emanations’ from a device’s LED power indicator.  These minute variations are caused by voltage changes to speakers, indicating differences in sound. In hacker circles, the method is known as a ‘Glow-worm spy attack’.