Here is the actual AMA report. http://darksky.org/wp-content/uploads/bsk-pdf-manager/AMA_Report_2016_60.pdf http://darksky.org/wp-content/uploads/bsk-pdf-manag

Here is the actual AMA report. http://darksky.org/wp-content/uploads/bsk-pdf-manager/AMA_Report_2016_60.pdf http://darksky.org/wp-content/uploads/bsk-pdf-manager/AMA_Re... A representative section. "It is estimated that a “white” LED lamp is at least 5 times more powerful in influencing circadian physiology than a high pressure sodium light based on melatonin suppression. Recent large surveys found that brighter residential nighttime lighting is associated with reduced sleep time, dissatisfaction with sleep quality, nighttime awakenings, excessive sleepiness, impaired daytime functioning, and obesity. Thus, white LED street lighting patterns also could contribute to the risk of chronic disease in the populations of cities in which they have been installed. Measurements at street level from white LED street lamps are needed to more accurately assess the potential circadian impact of evening/nighttime exposure to these lights."