You are currently browsing the tag archive for the ‘LEDs’ tag.

One of the most critical design parameters in an LED illumination system is the system’s ability to draw heat away from the LED package. High operating temperatures at the LED junction affect the performance of the LED adversely, resulting in colour shifts and decreased light output and lifetime for the LED package… (more)

One of the most critical design parameters in an LED illumination system is the system’s ability to draw heat away from the LED package. High operating temperatures at the LED junction affect the performance of the LED adversely, resulting in colour shifts and decreased light output and lifetime for the LED package… (more)

One of the strongest propositions of LEDs is their long lumen maintenance in contrast to most conventional light sources. The market perception of an LED’s reliability is reinforced by the widespread practice among lighting manufacturers of offering long warranties on their LED luminaires… (more)

How LEDs improve drivers’ vision and IREDs enable the early detection of dangerous situations. Only 20% of all vehicles travel the road at night. Yet, according to an investigation by the DVR (German Road Safety Council), approximately one third of all traffic accidents occur during this time. Frequently they are caused by insufficient visibility conditions or driver fatigue. For this reason, automotive developers focus on the topics “See better and be seen better” and “Active support for drivers”… (more)

Eskom has been placing much effort into driving the adoption of energy efficient lighting technologies in homes and businesses. While success has been achieved with these programmes, it remains important that the end-user be aware of the many factors to consider… (more)

The colour of light sources is described in industry primarily in terms of two metrics, correlated colour temperature (CCT) and colour rendering index (CRI), that are related indirectly to human perception… (more)

One just has to Google LED to learn that the concept of a light emitting diode has a long history but was slow to develop beyond the replacement of panel and indicator lights. It was only when the cost of energy became an issue that major developments took place in a very short space of time. Reading today’s technical literature, one can only come to one conclusion – the potential of light emitting diode technology is relatively untapped… (more)

This paper reviews some of the factors that should be considered when selecting energy efficient lamps to replace existing quartz halogen downlighter lamps. Users should be prepared to accept lower light levels and a colour shift resulting in a change in the room appearance. The degree of change can be minimised with the correct selection of replacement lamp… (more)

Lighting manufacturer predicts that by 2020 some 75% of its new lighting sales will be LED solutions.The development of high quality light emitting diodes (LEDs) has reached a tipping point where this new technology can be used for general lighting in almost all applications… (more)

Poor thermal management can lead to early LED product failure. Fortunately, these types of failures can be avoided in the design phase with the use of simple, inexpensive thermal management techniques. This article discusses these techniques and is intended to give manufacturers, engineers, and product managers some basic tools for good LED thermal system design… (more)

Work is under way within the International Commission on Illumination (CIE) to recommend a new procedure for assessing the colour rendition of light sources for general illumination. Nine competing proposals are currently under consideration by the technical committee responsible for this task. Finding consensus amongst all interested parties has been difficult… (more)

With lighting accounting for about 40% of the energy used in buildings, the question of how to save energy on lighting is becoming increasingly valid. What are the possibilities and the considerations? This article defines a framework on how to implement energy-saving lighting solutions, using the workplace as example. First of all it is important to realise that energy efficient lighting is a combination of the following factors…  (more)

I am writing in response to two articles that appeared in Vector, June 2011.Firstly, on your article, “White light: the downsides?” In this article, mention is made of the LPS (SOX) lamp which is undoubtedly the most efficacious lamp source available at 200 lm/W. But the HPS lamp with its smaller arc tube is the most efficient light source available in spite of its efficacy only being up to 140 lm/W… (more)

Streetlights that use light-emitting diodes (LEDs) cut electricity consumption by up to 80%. Not only are LEDs efficient; their light can also be directed optimally. A stroll after dark in the historic city center of Regensburg, Germany, raises a question. Do modern LED streetlights fit in harmoniously in the narrow medieval lanes of a World Heritage Site city?… (more)

 By supporting the redesign of tower clocks with the latest LED technology, Osram has received the Viscom 2010 Best Practice Light Advertising Award… (more)

New lighting technologies are making inroads into the traditional sources that have held sway since the 1800s. A recent addition to the world of lighting technology are miniature light-emitting diodes (LEDs). These lights, according to the Radiant group, are set to become the standard source of illumination for the 21st Century… (more)

In the ever-increasing drive to save energy, governments play a key role. Efforts include setting goals for reducing energy use by banning energy-inefficient products, by promoting energy-efficient alternatives and by financing all kinds of energy-saving programmes… (more)

The purpose of this test is to determine how many 8-LED or 15-LED down lights are needed to achieve an average of 600 lux at a height of 0,85 m above ground. The goal is also to do a cost comparison between the 70 W metal halide light fittings and the cost during the lifetime of the 8-LED or 15-LED down lights… (more)

So many people in the lighting industry seem to believe that “minimising impact on the environment” means getting rid of the more tried and trusted lighting sources in favour of the newer “more efficient” light sources… (more)

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