Toshiba to Introduce Light Bulbs With 12,000-Hour Life

No Comments » April 10th, 2008 posted by // Categories: Energy Development Project

Toshiba to Introduce Light Bulbs With 12,000-Hour Life

4 03, 2008 19:46
Satoshi Ookubo, Nikkei Electronics

Toshiba Lighting & Technology Corp developed Neoball-Z Real Pride, a bulb shaped fluorescent lamp with a rated life extended to 12,000 hours.

The latest lamp has a rated life that is 1.2 times longer than that of the existing product (10,000 hours). Compared with an incandescent bulb, the rated life is approximately 12 times. The new lamp comes in three colors, warm white, day white and daylight. All types are a three band fluorescent lamp with high color rendering properties.

The rated power consumption is 10W. The total luminous flux of the warm white type is 810lm, while those of the day white and daylight types are 780 and 730lm, respectively. The lamp is slated for launch on July 1, 2008. There is no manufacturer’s suggested retail price.

To extend the product life, the company increased the diameter of the electrode coils so that the amount of emitter applied to them may be increased. The company reportedly optimized the coils to prevent the dispersion of emitter, which occurs when the lamp is turned on. In order to contain larger coils, the diameter of fluorescent tube is increased from 8 to 9mm. This also stabilizes the voltage on lighting.

The luminous efficiency is usually deteriorated when the fluorescent tube diameter is increased. To compensate for the deterioration, the company increased the length of spiral fluorescent tube (discharge length) from 300 to 400mm. In this way, the new lamp ensures the luminous efficiency equivalent to that of the existing product.


Longer discharge length enabled by polycarbonate globe

The company devised a new technique to insert the spiral fluorescent tube in a globe. A globe is an opaque white cover covering the entire tube. The existing product uses a unitary globe, and the spiral tube was inserted in the globe from the base.

Through this method, however, the discharge length of the spiral tube is limited because the base diameter is predetermined. A longer discharge length results in an increase in the diameter of spiral tube as a whole, thus making it impossible to insert the tube in the globe from the base.

In the latest product, the globe is not provided as a unitary part, but is separated into upper and lower parts. The upper globe is placed over the lower globe after the spiral fluorescent tube is placed in the lower globe. Then, joint surfaces of the upper and lower globes are bonded together.

The new method made it possible to insert a larger tube so that a spiral tube with a longer discharge length can be used. The new lamp uses a plastic globe unlike the existing product using a glass globe.


Satoshi Ookubo, Nikkei Electronics

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