January 2009 Archives

Who turned on the lights?

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Recently refurbished National Express trains have been fitted with reading lamps "upfront", and each one has a switch - but they are never used.

The joys of modern technology allow me to write and post this blog from a seat on the 12:05 Leeds to London train service.

Three Worlds Collide

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What do you get if you put traditional lighting suppliers, LED suppliers and the NHS in a room? - This may sound like a joke but it's not. Rotherham NHS is looking to the future and trying to find ways to reduce the lighting related energy bill.

Is it really that eco friendly?

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When designing products these days, designers have to be very conscious of their choices in regards to materials and processes used for manufacture. A lot of people assume that a products impact on the environment is only relevant when the product is in use. However, products which can be relatively eco friendly to run, such as the Hybrid cars, can be very un-eco friendly to manufacture and dispose of.

Make the best use of LED's

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What people in the LED community fail to realise is that the T12 and T8 flourescent tubes are really really good at what they do.  They are very efficient, (more efficient than the production LEDs you can buy today), far cheaper to make and realitively long lifed.  Until LEDs have improved their efficiency by another 50% its pointless anyone trying to make a replacement for the T12 and T8 use in general office type lighting.

In specialist lighting it does make sense but they didn't win the job on the basis of unit cost or efficiency.  Unfortunately no optic will help anyone beat the T12 and T8 because using it doesn't reduce the cost over bare LEDs and it doesn't create more Lumens.
Rensselaer Polytechnic Institute small.jpg
An LED-related article has just been posted on Electronics Weekly:

Rensselaer designs power LED retaining efficiency at high current
The US Rensselaer Polytechnic Institute has designed a power LED that retains efficiency at high current. "The device achieves a notable reduction in efficiency droop, a well-known phenomenon that provokes LEDs to be most efficient when receiving low-density currents, but then to lose efficiency as higher currents are fed into the device," said the university. Read the full story >>

LED Company name generator

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I received a copy of the VIZ annual for christmas, on one page was a useful tool for TV executives to name reality shows - .i.e celebrity -electronics design - boot camp. With so many companies starting up in the LED space I have created my own version to help anyone searching for a start-up name.

For crying out loud ...

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That's me having a Jeremy Clarkson moment on seeing this headline.

"Brooklyn Park residents complain LED bulbs are too dim."

The article in an American paper reports that some people in Brooklyn Park, NY say the energy-saving streetlights now being tested aren't such a bright idea. This is on the level of the New York City residents complaining that they could not see our LED Beacon light from a car on the top of the George Washington Bridge, because the flashing red light was a staple of NYC.  Our light was designed to purposely reduce ground scatter, or the "non useful" light shining downwards.  They actually made us re-design them a special Beacon with scatter built-in so the citizens would not complain.

At least I agree with one of the reader comments on this article:

"Remember when we had plain old incandescent lightbulbs for streetlights? They sure didn't put out any light, but they were a blast to break with snowballs."

Too much information

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I frequently have to use Google to check up on the accuracy of material I have received from different during the normal course of my working day.

One thing I've noticed recently is a complete spam of research papers (usually yours from anything between $495 and $4,995) taking up the first page of my search results. These papers seem to come from a variety of self proclaimed "experts" and promise you some kind of way to get ahead of the market if you'd only get out your credit card.

Why can LED not yet rival halogen?

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The way LED bulbs give off heat, and the way halogen bulbs give off heat are completely opposite. Halogen bulbs give off heat from the light they output, warming up the rooms they light. LEDs give off heat from behind the light source, and if this is not dispersed correctly the LED will lose it's brightness and eventually stop working.

Another role for LEDs

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Happy new year everyone!

I wrote in my last blog about the continuing displacement of conventional lighting by LEDs in many applications, but I didn't expect LEDs to try compete in the tackiest of applications, Christmas lighting, quite so soon. Minnesota company Seasonal Impressions has developed a range of LED retrofit bulbs that are fully computer controlled allowing the creation of some amazing lighting displays. More can be seen here,

The development should at least save a fortune for the owner's of Vegas' casinos

LED LightingAn LED Lighting-related article has just been posted on Electronics Weekly:

Researchers calculate oil consumption benefit of energy-efficient LED lighting
If all of the world's light bulbs were replaced with energy-efficient LEDs for a period of 10 years, researchers at the US Rensselaer Polytechnic Institute claim, oil consumption would be cut by 962 million barrels, removing the need for 280 power stations, cutting carbon dioxide emissions by 10 billion tonnes, and ultimately result in financial savings of $1.83 trillion.

Rensselaer, known for fundamental LED research, has been looking at environmental impacts. Read the full story >>

LED - Perfect for applications

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As a lighting designer, the most common question I hear in regards to LED is:

"Can I light my room with them?".

Most people simply want to know if they can replace their filament bulb with something more energy efficient. The simple answer to this is yes. Our company have lit a number of houses, solely with LED. The energy consumption for lighting has been reduced by 75%, whilst still giving a good level of light.

The long answer to this question is yes, but for a price. To achieve a low energy lighting scheme you need to invest a substantial amount of money initially, in order to save money in the long run. The most reliable and strongest LED bulb which we have found, at the minute, which is suitable for domestic applications, is 8W. To gain the same light level that you would from a standard down lighter you would need to replace each fitting with two LED fittings. This is not affordable for the average person, or practical.

LED Lighting guides

See also Electronics Weekly's roundup of content related to LEDs, with a special focus on both white LEDs and coloured LEDs, and Lighting LEDs.

* White LEDs

* Coloured LEDs

* LED Lighting (1)

* LED Lighting (2)

* LEDs General

* LED optics

* OLEDs

* 50 year history of the LED








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Author Profiles

Paul Ward
As Opto Product Manager at Farnell, Paul is overseeing the company's involvement in the rapidly evolving and high profile LED lighting market sector.

As well as ensuring that Farnell offers the latest technologies and products related to solid state lighting, Paul is also responsible for ensuring that the resources are in place to make it easier for design engineers to specify and design-in LED solutions for their applications.

Educated in Production Engineering and Design at Sheffield Hallam University, Paul has worked in various engineering, training and marketing roles for companies including C&K switches, ITT Cannon, Cherry and LED specialist Chicago Miniature Lighting.

Away from the world of LEDs, Paul is a Founder of the charity RTTW, Photographer and Harley Davidson rider; he has ridden and snapped across Europe, New Zealand and the USA on his chrome hog!

Gordon Routledge
Gordon Routledge is one of the original pioneers in LED illumination having worked with LEDs in illumination applications since 1996. Currently VP of Illumination at Dialight, Gordon founded Lumidrives in 2001, having previously been managing director at ACDC Lighting Systems. Gordon has a degree in Electrical & Electronic Engineering from university of Manchester Institute of Science and Technology.

Ian Bryant
ian bryant.jpgIan Bryant is Business Development Manager LED Division at Carclo Technical Plastics. He has worked on and off at Carclo (Formerly Combined Optical Industrial) since leaving school. He has worked through the company from Toolmaking to starting the company on the road of LED optics business some 6-7 years ago, starting with a standard range and more in line with the business of custom optics. In between all this he has worked in engineering and as a works Director for a hydraulics company but kept getting pulled back to the optics industrial. We are able to offer the full solution from idea to parts so have a very good understanding on what is needed. You will see some posts from our design team also under my name.

About this Archive

This page is an archive of entries from January 2009 listed from newest to oldest.

December 2008 is the previous archive.

February 2009 is the next archive.

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