Although LEDs are the ultimate in lighting efficiency, they are still too costly for most uses. (earthpolicy.org)
If the high cost of LEDs drops faster than we have assumed, making widespread use feasible, lighting efficiency gains will come even faster than we have projected. (earthpolicy.org)
The test brought to light the efficiency of Bentley's powerful V - 8 engine, a newer option for the still - available W - 12 cylinder, the comfort of its cabin and chassis, and the accuracy of its navigation. (cnet.com)