The American Medical Association (AMA) has just adopted an official policy statement about street lighting: cool it and dim it. The statement, adopted unanimously at the AMA's annual meeting ... comes in response to the rise of new LED street lighting sweeping the country. Municipalities are replacing existing streetlights with efficient and long-lasting LEDs to save money on energy and maintenance. Although the streetlights are delivering these benefits, the AMA's stance reflects ... the close connection between light and human health. The new "white" LED street lighting ... has two problems. The first is discomfort and glare. Because LED light is so concentrated and has high blue content, it can cause severe glare ... and sufficient levels can damage the retina. This can cause problems seeing clearly for safe driving or walking at night. The other issue addressed by the AMA statement is the impact on human circadian rhythmicity. Lighting affects our normal circadian physiology. This could lead to some serious health consequences. White LED light ... is estimated to be five times more effective at suppressing melatonin at night than the high pressure sodium lamps (given the same light output) which have been the mainstay of street lighting for decades. Melatonin suppression is a marker of circadian disruption, which includes disrupted sleep. The AMA "encourage[s] minimizing and controlling blue-rich environmental lighting by using the lowest emission of blue light possible to reduce glare." All LED lighting should be properly shielded.