I believe you can also find more detailed info through [phys.org][1] (the link throws you in the website with the "incandescent light bulb" tag on).

Regarding "state of the art", I would refer you to [NanoLeaf][2] (formerly NanoLight. They just completed a Kickstarter campaign with a lot more money than they asked for, and have reviews in several renowned magazines and websites.


  [1]: http://phys.org/tags/incandescent+light+bulb/
  [2]: http://www.thenanoleaf.com/shop-now/nanoleaf-store/10w-nl-bl-detail