From 2011, DOE Municipal Solid-State Street
Light Consortium (MSSLC) conducted this experiment for the nine Kansas City,
Missouri SSL lamps. The experiment shows that the performance of LED slightly
better than high-pressure sodium lamp. U.S. Department of Energy (DOE)
announced on its website on the news. These LED lights installed in February
2011, after more than two years of testing, reveals the LED lights, although
not as high pressure sodium lamp lumen output or efficacy, the LED lights can
output more lumens to the road surface and reduce light spill. Taking into
account the technical level of these LED lights stay on in 2011, can be
considered the current technology allows LED street performance is more
prominent.
The project includes the installation
ranges from 63W to 291W LED lights instead of 100W, 150W, 250W, 400W sodium
lamp. Measurement results can be reduced 31-51% of energy, an average of
approximately 39%, but the LED lights reduces the average of about 31% of the
lumen. LED lights compared to high pressure sodium lamp efficacy average
increase of about 15%, but there are two LED product efficacy low than high
pressure sodium products. In addition, LED lights application effect is more
accurate, delivered to the target area of the lumen increases. LED lights still
has some significant advantages, for example, a 130W LED lamps replace 150W
high pressure sodium lights, LED lights efficacy of 83 lumens / watt, while high
pressure sodium lamp efficacy 45.1 lm / Watt. But they both have scattered
light. 250W class LED lights compared to pressure sodium light is no excess
light, LED lighting efficacy of 47 lumens / watt, high pressure sodium lamp of
33.6 lumens / watt.
Summing up the above results, LED lights slightly
more effective than high pressure sodium. SSL alternative offers significant
energy savings benefits, eliminating the light spill and to provide more
effective and uniform illumination, but also save maintenance costs.
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