US Doctors on LED

This was the subject of a Recent Report from CNN. The following are extracts:

The AMA’s statement recommends that outdoor lighting at night, particularly street lighting, should have a color temperature of no greater than 3000 Kelvin (K). Color temperature (CT) is a measure of the spectral content of light from a source; how much blue, green, yellow and red there is in it. A higher CT rating generally means greater blue content, and the whiter the light appears.

A white LED at CT 4000K or 5000K contains a high level of short-wavelength blue light; this has been the choice for a number of cities that have recently retrofitted their street lighting such as Seattle and New York.

But in the wake of these installations have been complaints about the harshness of these lights. An extreme example is the city of Davis, California, where the residents demanded a complete replacement of these high color temperature LED street lights.  A total of 650 4K LED street lights were replaced with 2700 K LED Street lights in residential areas.  In non-residential areas, 750 of the 4K Luminaires already installed were left in place.

The new “white” LED street lighting which is rapidly being retrofitted in cities throughout the country has two problems, according to the AMA. The first is discomfort and glare. Because LED light is so concentrated and has high blue content, it can cause severe glare, resulting in pupillary constriction in the eyes. Blue light scatters more in the human eye than the longer wavelengths of yellow and red, and sufficient levels can damage the retina. This can cause problems seeing clearly for safe driving or walking at night.

VeeLite is offering all its LED Products with 3K (3000 Kelvin) as well as 4K optics.  There is usually a small loss in efficiency with 3K optics compared to 4K optics.

Lighting Streets around the Titanic Quarter

Street Lighting in the Titanic Quarter of Belfast.

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