Does the latest generation of energy-saving light bulbs save energy? A comprehensive study conducted by Osram, the German lighting company, provides evidence that they do.

While that may seem self-evident, until therelease of the reporton Monday the answer remained unclear.

That is because no one knew if the production of LED lamps required more energy than needed for standard incandescent bulbs. While it is indisputable that LEDs use a fraction of the electricity of a regular bulb to create the same amount of light, if more energy were used in the manufacturing and distribution process, then the lighting industry could be traveling down a technological dead end.

The study results show that over the entire life of the bulb — from manufacturing to disposal — the energy used for incandescent bulbs is almost five times that used for compact fluorescents and LED lamps.

The energy used during the manufacturing phase of all lamps is insignificant — less than 2 percent of the total. Given that both compact fluorescents and LEDs use about 20 percent of the electricity needed to create the same amount of light as a standard incandescent, both lighting technologies put incandescents to shame.

“We welcome these kinds of studies,” said Kaj den Daas, chief executive of Philips Lighting North America. The Osram study “provides facts where we often have only emotional evidence.” Philips recently became the first entrant in the Energy Department’s L Prize, a race to develop the first practical 60-watt LED equivalent to a standard light bulb.

To calculate what is know as a Life Cycle Assessment of LED lamps, Osram compared nearly every aspect of the manufacturing process, including the energy used in manufacturing the lamps in Asia and Europe, packaging them, and transporting them to Germany where they would be sold. It also looked at the emissions created in each stage, and calculated the effect of six different global warming indexes.

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