Products, Materials + Tools | Jul 26, 2010

Citizen Develops 540 lm White LED for Illumination

Citizen Electronics Co. Ltd. developed the CL-L102-C7 white LED series for illumination, which can provide a luminous flux of 540 lm at an input current of 700 mA.

The newly developed “CL-L102-C7 Series” is an expansion of the existing CL-L102-C3 Series, and inherits the metal core base package, which is an excellent radiator. Without altering the dimensions of the product, we have succeeded in more than doubling the luminous flux.

In terms of performance as a general light source, this new product provides more luminous flux with just one LED lamp than the widely used 40 W incandescent light bulb or the light bulb-shaped 8 W fluorescent tube, which is becoming a common alternative to the 40 W bulb (total luminous flux of both: 485 lm). The new product contains no infrared (heat) or ultraviolet radiation within its spectral output, making it suitable for installation in places where the use of incandescent or fluorescent light sources is not an option. For applications such as solar battery systems, where priority is placed on luminous efficiency, our new product can be used with a lowered input current to obtain a luminous flux of 150 lm at an efficiency of 110 lm/W.

Citizen product managers are convinced that this product, which can provide luminous flux on a par with widely used general lighting sources at a high luminous efficiency, in an extremely thin package, and with the LED’s long life, will open up new possibilities in the development of lighting applications. Citizen Electronics will continue to strive for further enhancement of luminous flux and luminous efficiency, as well as continuous development of LED lamps that combine these two attributes to help popularize the use of LED lighting.

Citizen will also mass-produce a 2900K color temperature type as a standard product. Samples of the new product are expected to be available in October 2007. Shipment of volume production is scheduled for January 2008.

Comparison of new product with existing LED light source:

Product	CL-L102-C7N (new product)		CL-L102-C3N (existing LED)
Input current (mA)	700	350	350
Total luminous flux (lm)	540	310	245
Luminous efficiency (lm/W)	74	90	70
Color temperature (K)	5000
External dimensions (mm)	L:50 X W:7 X H:2

Changes in properties according to input current:

Product	CL-L102-C7N (The new product)
Input current (mA)	700 (Standard operation)	160 (Priority on efficiency)
Total luminous flux (lm)	540	150
Luminous efficiency (lm/W)	74	110

About Citizen:
Citizen Electronics Co., Ltd. (Head Office: Fujiyoshida City, Yamanashi Prefecture. President: Takashi Masuzawa. Paid-in capital: 1,988.55 million yen), a precision electronics manufacturer and a subsidiary of Citizen Holdings Co., Ltd., has developed the “CL-L102-C7 Series” of high power white LED lamps that combine high luminous flux and high efficiency to achieve the highest standards for LED illumination in the world.

Citizen Electronics has built an abundant track record as a leading company in LED light sources for electronic devices such as mobile phones. The company has taken that experience and entered the field of high power white LED for general lighting, where Citizen achieved the world’s highest standard for luminous efficiency at the mass production level. The already commercialized CL-L102-C3 Series, which successfully combines a luminous flux of 245 lm and a luminous efficiency of 70 lm/W, has been adopted by many lighting equipment manufacturers both in Japan and abroad.

For additional information visit CITIZEN homepage .