Sharp Introduces New High Power LED Lamp: 93.3 lm/W in the 50W Class

Sep 30, 2011 Sharp Corporation  announced in press release that the company has has developed and will introduce a high-power LED lighting device that features the industry's highest luminous efficacy of 93.3 lm/W(1) (lumens/watt) in the 50W input power class as a light source for applications such as downlighting in retail stores.

This newly developed device, the GW5DME30MR5, incorporates an LED chip with high emission efficiency combined with a proprietary blend of phosphors. As a result, it achieves a luminous efficacy of 93.3 lm/W, the industry's highest in the 50W input power class, at the 3000K color temperature commonly used in downlights for retail stores and with a color rendering index(2)(Ra) of 83. It achieves high energy-saving performance. In addition, proprietary package technology provides for greater color consistency(3), contributing to higher quality in the design and development of lighting fixtures.

The lineup also includes high-performance models that feature a color rendering index (Ra) of greater than 90 to meet the need for light sources which require higher color rendering properties.

Major Features
1. Industry's highest luminous efficacy of 93.3 lm/W in the 50W class.
2. Proprietary package technology provides for greater color consistency.
3. Lineup also includes high-performance models with a color rendering index (Ra) of greater than 90.
(1) Brightness per watt. As of September 29, 2011, for LED lighting devices with an input power of 50W, a color temperature of 3000K (GW5DME30MR5), and a color rendering index (Ra) of 83 (based on Sharp research).
(2) A numerical value expressing the level of color distortion compared to a reference light source. The closer the value to 100, the closer to natural light.
(3) Satisfies "3-step MacAdam ellipse" color-tolerance criteria at operating temperature levels encountered during practical use (Tc = 90 degrees C). "MacAdam ellipses" form the basis of a control standard for determining how much variation in color can be tolerated among discrete LED lighting devices that are manufactured in volume. The ranges of tolerable variations in color are plotted as ellipses on a CIE x/y chromaticity diagram, and can be categorized into 1-step (the human eye is unable to perceive any variation in color among devices), 2-step to 3-step (levels where color variations are difficult to perceive), and 4-step to 7-step (levels where color variations are noticeable to the human eye.

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Author:  Alice Jones

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