Research has been there for 6-7 years on the blue spectrum but the DOE has doted on its generous contributors like GE and rebuffed the arguments. The real research is just getting started and it is not pretty. I'm not a global warming believer but the blue light hazard is very real and the damage it has done to the ecosystem is incredibly destructive and worse, cyclical. It is very easy to prove to the naysayers. The only visible energy that is completely artificial at night is blue - even the full moon has very little blue. When the first electric street lights were introduced there was only trace amounts of blue because the technology to create it was not there at the time. With the adoption of HID lighting, the problem grew by an order of magnitude but the introduction of the LED street light and the rush to adoption because of stimulus funds will exponentially worse.