IOWA CITY - The City of Iowa City and MidAmerican Energy have signed an agreement to convert the city's roughly 4,000 street and pedestrian lights to light-emitting diode, or LED, units over the next ...

Compared to incandescent lightbulbs, LEDs produce a lot more lumens per watt of input power — they’re more efficient at producing light. Of course, that means that incandescent light bulbs are more ...

Critics of Phoenix's new LED streetlights say the fixtures shine such a harsh, white light that it reminds them of a sterile hospital waiting room, floodlights bathing a prison yard or an alien ...

Tucson’s skies are slightly darker thanks to the completed streetlight conversion project, according to a study by the Tucson-based International Dark-Sky Association. The study, however, was limited ...

TESS, a Taiwanese manufacturing company, recently introduced a 7W LED bulb that, at 560 lumens, can serve as a replacement for a typical 500-lumen, 40W incandescent bulb (Figure 1). TESS has received ...