If only there were a light bulb as efficient as a compact fluorescent light (CFL), but without the ghastly green light and brain-eating toxic mercury. Am I asking too much? The inventors of the Electron Stimulated Luminance (ESL) lights don’t think so. A company called Vu1 plans to sell ESL bulbs in Europe and the Mideast in 2013. Vu1 lights are based on cathode ray tube (CRT) technology, are dim-able and have the cozy glow of incandescent light bulbs. How did Vu1 accomplish this magic? It helps that I know a little bit about CRTs from the days when my brother and I repaired old televisions.