Plants naturally take in carbon dioxide they need for photosynthesis, the process of changing light energy to chemical energy.

VOA: special.2010.01.26

A special needle is inserted directly into the tumor and light energy is passed through a laser.

VOA: special.2010.11.23

It involves the relationship of energy, mass and the speed of light, written as the letter c.

VOA: special.2010.07.16

When a light particle,or photon, hits an electron, the electron jumps to a higher energy state.

VOA: special.2010.09.01

Among the products were TVs that use light emitting diodes, or LEDs,to save energy.

VOA: special.2010.01.26

This is the story of how one man combined LEDs with solar energy technology to bring high-quality, low-cost electric light to poor people around the world.

VOA: standard.2009.12.13

Back in his laboratory at the University of Calgary,Alberta, he experimented with light emitting diodes, technology he was familiar with as a professor of renewable energy.

VOA: standard.2009.12.13

State utility Florida Power and Light says its Arcadia plant will produce 25 megawatts of energy, making it the largest in the nation at least for now.

VOA: standard.2009.10.27

In contrast,a light bulb has much more impact in the use phase, where it's using the energy, and where you can reduce that with more efficient lighting technologies,"

VOA: standard.2009.03.30

Though Iran was to respond by Friday, the International Atomic Energy Agency said Iran told it that while it was considering the plan in a favorable light it needed until the middle of next week to make a decision.

VOA: standard.2009.10.24

He's also decided to give up leadership in Light up the World Foundation to start a company in India that will develop a more energy-efficient and cheaper lighting system that he hopes will bring even more light to the world's poor.

VOA: standard.2009.12.13