LA Times: Didn’t think so. But what if it used 90% less electricity than a standard incandescent bulb, cut greenhouse gas emissions and saved you about $280 over its 25-year life span? That’s the challenge facing Dutch start-up Lemnis Lighting, which on Friday began selling the American version of what apparently is the world’s first dimmable LED bulb compatible with home light fixtures. LEDs — light-emitting diodes — are semiconductors that glow and are considered one of the great …