Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:


LED Concept for Efficient, Warm-white Light

A new LED concept from Osram Opto Semiconductors makes it possible to combine maximum efficiency with very good color rendering properties.

Until now, it was almost impossible to achieve high efficiency with a warm-white LED light similar to that of an incandescent lamp, because the warmer the white light was, the lower the luminous efficiency became.

And energy efficiency dropped even lower if you also wanted to have very good color rendering properties. Now there’s ‘Brilliant Mix’, a special combination of white and red LEDs that boosts the efficiency of warm-white LED lamps by almost one-third. What’s more, the LED light’s color rendering value of over 90 even surpasses that of energy-saving bulbs.

These LEDs would be particularly attractive for department and clothing stores, where customers need to judge colors and should feel comfortable. A white LED usually consists of a blue-glowing chip coated with a layer of phosphor. Excited by the blue light, the phosphor layer glows yellow. The superimposition of the two colors appears as a cold shade of white to viewers. Warm shades of white are created with the help of reddish converters, which, however, absorb light. Because most LED lamps consist of several light-emitting diodes, the ‘Brilliant Mix’ concept combines very efficient white LEDs using a special type of phosphor with red LEDs.

This creates a warm-white light with an efficiency of over 100 lumens per watt (lm/W). An energy-saving bulb has a luminous efficiency of about 60 lm/W. The new concept achieves high efficiency with the help of improved chip technology, a more efficient converter material, and other factors.

A light source’s color rendering properties are dependent on its frequency spectrum — only colors that are emitted are also reflected. LEDs using the Brilliant Mix concept emit light over a broad spectrum, which is why they have very good color rendering properties. ‘Brilliant Mix’ even achieves a color rendering index value of 98 for the especially critical flesh tones. This result is almost identical to the reference value for daylight, which is 100. The ratio of red to white LEDs makes it possible to create light with a color temperature of 2,700 to 4,000 Kelvin (the former value corresponds to that of an incandescent lamp).

Osram Opto Semiconductors is a subsidiary of Osram, which is owned by Siemens. Highly efficient LED lighting forms part of the Siemens Environmental Portfolio, which generated around €28 billion in sales for the company in fiscal year 2010.

Dr. Norbert Aschenbrenner | Siemens InnovationNews
Further information:

More articles from Power and Electrical Engineering:

nachricht New method increases energy density in lithium batteries
24.10.2016 | Columbia University School of Engineering and Applied Science

nachricht 'Super yeast' has the power to improve economics of biofuels
18.10.2016 | University of Wisconsin-Madison

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Light-driven atomic rotations excite magnetic waves

Terahertz excitation of selected crystal vibrations leads to an effective magnetic field that drives coherent spin motion

Controlling functional properties by light is one of the grand goals in modern condensed matter physics and materials science. A new study now demonstrates how...

Im Focus: New 3-D wiring technique brings scalable quantum computers closer to reality

Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.

"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...

Im Focus: Scientists develop a semiconductor nanocomposite material that moves in response to light

In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.

A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...

Im Focus: Diamonds aren't forever: Sandia, Harvard team create first quantum computer bridge

By forcefully embedding two silicon atoms in a diamond matrix, Sandia researchers have demonstrated for the first time on a single chip all the components needed to create a quantum bridge to link quantum computers together.

"People have already built small quantum computers," says Sandia researcher Ryan Camacho. "Maybe the first useful one won't be a single giant quantum computer...

Im Focus: New Products - Highlights of COMPAMED 2016

COMPAMED has become the leading international marketplace for suppliers of medical manufacturing. The trade fair, which takes place every November and is co-located to MEDICA in Dusseldorf, has been steadily growing over the past years and shows that medical technology remains a rapidly growing market.

In 2016, the joint pavilion by the IVAM Microtechnology Network, the Product Market “High-tech for Medical Devices”, will be located in Hall 8a again and will...

All Focus news of the innovation-report >>>



Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

Agricultural Trade Developments and Potentials in Central Asia and the South Caucasus

14.10.2016 | Event News

World Health Summit – Day Three: A Call to Action

12.10.2016 | Event News

Latest News

Oasis of life in the ice-covered central Arctic

24.10.2016 | Earth Sciences

‘Farming’ bacteria to boost growth in the oceans

24.10.2016 | Life Sciences

Light-driven atomic rotations excite magnetic waves

24.10.2016 | Physics and Astronomy

More VideoLinks >>>