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Wednesday, September 30, 2009

LED bulbs by Panasonic

The new products use Panasonic's own heat dissipation technology to increase the bulb's energy-efficiency. Generally speaking, LED's luminous efficiency increases as temperature decreases. So it is important to lower and optimize the temperature of an LED package to achieve higher luminous efficiency. By applying alumite treatment to the surface, Panasonic successfully increased heat dissipation to lower the temperate of the LED package. Combining this technology with the design which tightly joins the LED package and the casing, the company has achieved the industry's highest energy efficiency in LED bulbs1).

Also, when used as a downlight, the 6.9 W standard type LED bulbs deliver the brightness equivalent to 60 W incandescent bulbs5). That means it can save up to 2,000 yen per year on energy bills. The 4.0 W standard and 5.5 W compact LED bulbs produce the output comparable to 40 W incandescents and the 7.6 W standard LED bulbs have the brightness of 60 W incandescents when used as a downlight6).

Panasonic also made the new LED bulbs the lightest2) in the industry by making the casing thinner and reducing the amount of aluminum used in the product. The standard size E26 base bulb weighs only 100 g and the compact size E17 base bulb weighs 50 g.

Further, Panasonic employed its own thermal analysis technology to optimize the heat dissipating configuration (heat sink) to create the most compact E26 base LED bulbs in terms of length and outer diameter. The new LED lamps, including the industry's first E17 base LED bulbs, will easily fit into existing fixtures with which other replacement bulbs did not physically match.

The E26 base LED bulbs have a long lifespan of up to 40,000 hours. That means they last for about 19 years when used for 5.5 hours a day. The E17 base LED bulbs have about 20,000 hour life span. The new LED bulbs also feature a durable glass globe using glass manufacturing technology Panasonic accumulated over the years. They emit virtually no UV or IR radiation. The 7.6 W standard type and the 5.5 W compact type LED bulbs are dimmable from 10 percent to 100 percent.

Notes:

1) The standard type LDA7D-A1 LED bulb, which produces the brightness equivalent to a 40 W incandescent lamp when used without fixtures, has luminous efficiency of 82.6 lm/W and standard type LDA4D-A1 LED bulb, which produces the brightness equivalent to a 30 W incandescent lamp when used without fixtures, has luminous efficiency of 85.0 lm/w, as of September 10, 2009.

2) As a standard type LED bulb, as of September 10, 2009.

3) In terms of length and outer diameter.

4) As a compact type LED bulb (E17 base) which produces the brightness equivalent to a 25 W mini-krypton when used without fixtures.

5) Direct lighting when used with the LB72630Z fixture by Panasonic Electric Works (PEW).

6) Direct lighting when used with PEW's LB72106 (4.0 W LED bulb), LB72630Z (7.6 W LED bulb) and LB74059 (5.5 W LED bulb) fixtures.


in Panasonic

Tuesday, September 29, 2009

Open the (Virtual) Lab

Open the (Virtual) Lab

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Saturday, September 26, 2009

Moon: gives more water


"WATER is widespread on the surface of the moon – even in the hottest areas, scientists said yesterday.

Separate analyses using data from India’s Chandrayaan-1 satellite and two US spacecraft, Cassini and the Deep Impact probe, found evidence of water in the moon’s soil and showed it was widespread across its entire surface, according to a series of articles to be published in the journal Science."

in Dispatch

Using a NASA instrument housed on the Indian Chandrayyan-1 satellite, scientists have solved an Apollo-era mystery about water on the moon. The discovery could have profound implications for future human explorers on our nearest celestial neighbor.

in astrobio.net

image: astrobio.net

Thursday, September 17, 2009

PhysicsCentral: Buzz Blog

PhysicsCentral: Buzz Blog

WASHINGTON - For the first time, physicists have photographed the structure of an atom down to its electrons.

The pictures, soon to be published in the journal Physical Review B, show the detailed images of a single carbon atom's electron cloud, taken by Ukrainian researchers at the Kharkov Institute for Physics and Technology in Kharkov, Ukraine.

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