Appliances & Lighting
By HDK / Published on Tue, 2009-06-09 11:32
Read full story
By Hans De Keulenaer / Published on Wed, 2009-01-28 19:50
Inês M. Lima de Azevedo, Climate Decision Making Center, Engineering and Public Policy Department, Carnegie Mellon University, USA
Read full story
By Stefan Fassbinder / Published on Wed, 2008-09-03 18:32
Incandescent lamps are cheap but tend to have short lifetimes. The light emitted by incandescent sources is perceived as particularly pleasant because these hot radiators generate a continuous (or full) emission spectrum. But this very fact means that they waste much of the electrical energy supplied to them. Compact fluorescent lamps (CFLs) are actually the least compact of all the various lamps commercially available at present (Figure 1).
Read full story
By Anne Rialhe / Published on Tue, 2007-11-13 14:09
Technology
LEDs contain a semiconductor crystal that gets excited by a DC power supply, leading to the emission of light in one spectrum (color).
Thus white light can’t be emitted directly: one can use a combination of different colored LEDs making use of a coating. White LEDs emit in the blue or UV specter, phosphor coating makes it appear white.
Read full story
By Hans Nilsson / Published on Tue, 2007-08-14 07:00
The Lumina project, which is engaged in development of LED-lighting equipment, primarily for use in developing countries and in applications where people do not have access to conventional power, has studied the quality of White LEDs (WLED). The results are remarkable! In 26 batches studied, there is a huge variation in efficacy (Lumens/Watt) by a factor of 5! Even within the batches, there are enormous variations. So, quality management and assurance is of major importance for WLEDs before they can compete for any applications.
But that is not all!
Read full story
By Rob Van Heur / Published on Tue, 2007-07-10 00:00
The amount of energy consumed by lighting systems is significant, estimated, in 2005, at 2600 TWh (terawatt-hours) or 19% of total global electricity consumption. Over the last decade it is estimated that global demand for artificial light grew at an average rate of 2.4% a year. In terms of lumens, not electricity consumed, about 12 % lighting is used for outdoor lighting, 15% for residential lighting and the remainder for commerce and industry.
Read full story
By Hans Nilsson / Published on Thu, 2007-07-05 07:00
LED (Light Emitting Diode) applications have so far looked rather odd when they have been advertised as replacements for lightbulbs. Now, there is an application with a replacement product for light tubes that also look like a tube.
As with so many other new products, they are tremendously expensive and in this case a tube will cost you 100-110€ a piece. However, if the technology works, that price will surely drop fast.
Read full story
By Hans De Keulenaer / Published on Fri, 2007-03-09 14:32
By Peter Hanselaer, KaHo St Lieven
Nowadays, LEDs have become very popular light sources in decorative applications. The breakthrough of LEDs in general lighting is subject of discussion between believers and non-believers.
Read full story
By Sergio Ferreira / Published on Fri, 2007-02-09 16:17
Savings Potential:
By Hans De Keulenaer / Published on Sun, 2006-10-29 12:49
Together with a Hungarian transportation system specialist, Siemens is equipping all the traffic lights of Budapest with light-emitting diodes (LEDs). These semiconductor light sources consume up to 90 percent less power, and they are brighter than the conventional lamps in traffic lights. Despite a high initial investment, the city treasurer incurs no additional charges: A financing model from Siemens distributes the costs over monthly installments that are smaller than the savings from the lower power consumption and maintenance costs.
Copyright: Siemens
Read full story
By Hans De Keulenaer / Published on Wed, 2006-10-25 12:51
Date: December 5, 2006
Time: 15h00 - 16h00 (Europe Daylight Time)
Speaker: Peter Hanselaer, Laboratory for Lighting Technology, KaHo St-Lieven
Read full story
By Hans Nilsson / Published on Thu, 2006-10-12 05:08
The International Finance Corporation, a branch of the World Bank, has launched the project "Lighting the Bottom of the Pyramid" aimed at the replacement of kerosene lighting with solar-powered LED units in Ghana and Kenya. The project cuts into a 40 BUSD-market that the 1.6 Billion people who does not have access to electricity spend on kerosene every year.
Read full story
By Hans Nilsson / Published on Wed, 2006-07-26 05:04
Will half of the worlds lighting 20 years from now be from solid state LED (Light Emitting Diodes)? From a device that some years ago was used only to indicate that electronics was in stand-by? If so, this source have to improve its performance in lumens per watt by a factor 5 (to 150 lumens per watt), but would then be able to reduce installed power with 120 GW and saving 350 Mtonnes of Carbon-dioxide each year, according to the MIT Technology Review.
Read full story
By Hans Nilsson / Published on Wed, 2006-06-14 05:05
One of the lesser-known (in industrialised countries) burdens for ordinary people in developing countries is fuel-based lighting. Lack of access to electricity forces the use of kerosene lighting that burdens both poor people's economy and the climate. It also has an impact on women's labour and the local environment. A change would give multiple dividends.
Read full story
