Information Security & US & Life & Love & Fashion & Hacking & Passion

For an eye-popping introduction to the future of lighting, walk into the lobby of Philips Color Kinetics' headquarters outside Boston. The reception area is bathed first in pink, then lavender, then pink again. Hallways on either side undulate with a tunnel of pulsing blue, then purple, lights. The surrounding walls display Philips' latest products as they have been installed in a rotating selection of buildings, including the CN Tower in Toronto and Harrah's casino in Atlantic City, N.J. All this lighting is done with light-emitting diodes, or LEDs.

The energy-hogging incandescent lightbulb as we know it got a death sentence when President Bush signed the Energy Independence Act in December 2007; most such bulbs will be phased out beginning in 2012. Europe is nixing incandescents beginning in 2009. The race is on to develop devices that do a better job of converting electricity to light. Compact fluorescent bulbs have become a popular alternative, but LEDs have the potential to be twice as efficient. They typically last 50,000 hours, compared with 10,000 for a compact fluorescent and 1,000 for an incandescent bulb.

The hurdle so far is price. LEDs, semiconductor diodes that light up when current runs through them, are 10 to 20 times as expensive as incandescents, too high for use at home. But the Department of Energy predicts that steady improvements in semiconductor manufacturing will bring the price of white LEDs below that of compact fluorescents in five years. Large consumers of electricity see a quicker payback. Wal-Mart Stores (nyse: WMT - news - people ) and Shaw's have begun putting LEDs in some freezer cases. Lansing, Mich. is testing LED street lights. "The consumer is the last to convert," says Charles Jerabek, chief executive of Osram Sylvania, Siemens (nyse: SI - news - people )' North American lighting division. LEDs account for only 12% of the unit's $2.5 billion in revenue, but it's the fastest-growing piece.

At Osram Sylvania labs in Danvers, Mass. researchers are experimenting with blankets woven with LEDs to treat babies with severe jaundice. They're also developing LEDs for use in endoscopic surgery to replace the xenon lights currently in use, which are bulky and don't last long. Another innovation: square tiles of light that could replace fluorescent office ceiling lighting.

Twenty miles away in the showroom at Philips Color Kinetics a "screen" made of 50 vertical tubes (each 2 inches wide and 4 feet tall and composed of 760 individual diodes) of programmable LEDs projects a parrot moving in a forest, then flames flickering in a fireplace. By feeding video input into a computer, Philips makes the LED tubes function as a low-resolution video screen. Since LED lights can be tuned to different wavelengths of color, Philips is also working with retailers of luxury goods and jewelry to choose the best color for showcasing each product. Diamonds look best under blue-tinged white light, while gold shows better in warmer tones.

ElectroniCast Consultants of Upper Lake, Calif. says the market for LEDs in lighting should grow to $1.4 billion in 2009. "As the price continues to drop and the performance continues to increase, we'll see more adoption," says Philips Color Kinetics' vice president of innovation Kevin Dowling. "We haven't scratched the surface of this technology."

Commandos who stormed the Mumbai headquarters of an ultra-orthodox Jewish group found the bodies of five hostages inside, including a New York rabbi and his wife, officials said, as a fresh battle raged at the luxury Taj Mahal hotel and other Indian forces ended a siege at another five-star hotel.

More than 150 people have been killed since gunmen attacked 10 sites across India's financial capital starting Wednesday night, including 22 foreigners - four of them Americans, officials said.

Early Friday night, Indian commandos emerged from a besieged Jewish center with rifles raised in an apparent sign of victory after a daylong siege that saw a team rappel from helicopters and a series of explosions and fire rock the building and blow giant holes in the wall.

Inside, though, were five dead hostages.

A delegation from Israel's ZAKA emergency medical services unit entered the building after the raid and reported through an Indian aide that five hostages and two gunmen were dead, a ZAKA spokesman in Israel said. The spokesman had no information on the hostages' identities or whether there were wounded inside.

Jewish law requires the burial of a dead person's entire body, and the mission of the ultra-Orthodox ZAKA volunteers is to rescue the living - and in the case of the dead, carry out the task of gathering up all collectable pieces of flesh and blood.

Numerous local media reports, quoting top military officials, also said five hostages and two gunmen had been killed in the Jewish center.