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
Silicon solar cell of ISFH yields 25% efficiency with passivating POLO contacts
08.12.2016 | Institut für Solarenergieforschung GmbH
Robot on demand: Mobile machining of aircraft components with high precision
06.12.2016 | Fraunhofer IFAM
Physicists of the University of Würzburg have made an astonishing discovery in a specific type of topological insulators. The effect is due to the structure of the materials used. The researchers have now published their work in the journal Science.
Topological insulators are currently the hot topic in physics according to the newspaper Neue Zürcher Zeitung. Only a few weeks ago, their importance was...
In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.
Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...
Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
16.11.2016 | Event News
01.11.2016 | Event News
14.10.2016 | Event News
09.12.2016 | Life Sciences
09.12.2016 | Ecology, The Environment and Conservation
09.12.2016 | Health and Medicine