Dive summary:

• Both urban and suburban developers will be interested in a new streetlight design that  researchers say uses focused LEDs to put more light where it belong and less where it isn't wanted, reducing light pollution and perhaps disarming some objectors to new construction.
• The design by scientists at schools in Taiwan and Mexico also promises to cut power demand while boosting what's called the "optical utilization factor" for street lighting from the current high end of 45% to a range of 51% to 81%.
• Light that spills sideways and up from conventional, high-pressure sodium or mercury lights is blamed for several detrimental effects on wildlife and  pretty well wipes out astronomy in the area.

From the article:

Researchers at National Central University, Taiwan, and Unidad Academica de Fisica, Universidad Autonoma de Zacatecas, Mexico, have attacked the problem with a new LED street lamp designed to shine only where needed....