Y! Green: Lighting is a significant expense for many of us, and it also affects how we work, play, and feel. The good news is that new advances in technology are providing more comfort, flexibility and efficiency, as we learned in our new book Green Lighting. 1. $1 invested in efficient lighting pays back $6 in energy savings The standard incandescent bulb — what we typically think of as a “basic light bulb” — is a pretty inefficient piece of technology, wasting 90% to 98% of its …