Feature The Quest for Lumens per Watt Ryan Kelley Historically, the development of lighting has been driven by the need to get the brightest, most pleasing light possible at the lowest cost. Are we reaching the limits? Log in or become a member to view the full text of this article. This article may be available for purchase via the search at Optica Publishing Group. Optica Members get the full text of Optics & Photonics News, plus a variety of other member benefits. Publish Date: 01 November 2018 Add a Comment Please enable JavaScript to view the comments powered by Disqus.