Recently in Colour Category

1W of infra red light from an LED

By Alun Williams - Electronics Weekly.com on October 12, 2009 10:43 AM | No Comments | No TrackBacks
Osram has stacked two die to produce almost 1W of infra red light from an LED, writes our technology editor, Steve Bush.

"With its 1mm2 thin-film chip stack, at a driving current of 1A it generates almost twice the output of the standard chips that have been used up to now," claimed Osram.

"Preferred applications are those which require high radiance so that small optics can be used. This is important, for example, in pedestrian protection systems and night vision systems in vehicles."

Continue reading 1W of infra red light from an LED.

OLEDs with color temp spectrum of sunlight - Update

By Alun Williams - Electronics Weekly.com on July 22, 2009 1:17 PM | No Comments | No TrackBacks
29jul09sunlight 168.jpgWe briefly flagged, very recently, research carried out at the National Tsing Hua University in Taiwan, into organic LEDs with a full range of colour temperatures. They were capable of copying the full spectrum of sunlight throughout the day (2500 K - 8000 K) - Taiwan researchers create OLEDs with color temp spectrum of sunlight

Our Technology Editor, Steve Bush, got on the case to dig further into this work, and explain more about it. Make sure you read the resulting article - Voltage tunes OLED across all sunlight hues

The article begins:
Continue reading OLEDs with color temp spectrum of sunlight - Update.

Taiwan researchers create OLEDs with color temp spectrum of sunlight

By Alun Williams - Electronics Weekly.com on July 17, 2009 10:02 AM | No Comments | No TrackBacks
An interesting OLED development to note - from EDN's PowerSource blog by Margery Conner:
Researchers at National Tsing Hua University in Taiwan have developed organic LEDs (OLEDs) with a full range of color temperatures capable of mimicking the full spectrum of sunlight throughout the day (2500 K - 8000 K), making the technology especially useful for lighting in northern countries.
As the researchers explain, changing the voltage varies the color temperature by increasing the number of electrons and holes transported between certain layers. For example, at 3 volts, the illumination is predominantly red, at 5.5 volts it turns to pure white, and at 9 volts becomes bluish white."
See Researchers develop OLEDs with color temp spectrum of sunlight

Changing Colour Magnetic Ball Lamp

By Alun Williams - Electronics Weekly.com on June 30, 2009 5:28 PM | No Comments | No TrackBacks
magnetic ball lamp 2.jpgCheck this out.

Described as the Magnetic 4-Ball Color Changing Lamp, it does pretty much what it says on the tin: it features four magnetically attached balls with LED lights inside that change colors.

Thanks to Craziest Gadgets for flagging this one - it states the balls are removable and adjustable with magnets and are powered by the low voltage power rod in the middle.

Colour rendering index - LEDs versus incandescents

By Alun Williams - Electronics Weekly.com on May 26, 2009 1:29 PM | No Comments | No TrackBacks
LEDs are further challenging incandescents - a lighting product has been announced with a colour rendering index (CRI) of 92, putting it amongst incandescents for colour quality.

"The LRP-38 generates a CRI of 92 at a colour temperature of 2,700K. The tightly-focused beam delivers a centre beam candlepower of 4,000 with a beam angle of 20 degrees," said Cree. "This light is designed to replace 50-90W halogen PAR38 bulbs in various applications."

Input power is 12W - with the firm claiming a total delivered minimum efficacy of 42 lm/Watt.
Continue reading Colour rendering index - LEDs versus incandescents.

Site update: LEDs challenge incandescents in colour rendering

By Alun Williams - Electronics Weekly.com on May 1, 2009 1:30 PM | No Comments | No TrackBacks
yourfile.jpgAnother LED development story, from the News index:
LEDs are further challenging incandescents as LED maker Cree has announced a lighting product with a colour rendering index (CRI) of 92, putting it amongst incandescents for colour quality.
Read the full article >>

Also, check out:
« beacon | Main Index | Archives | Displays »

Electronics Weekly

LED Technology 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

 * LEDs General

* OLEDs

Recent Assets

  • LED 2009.JPG
  • Alien LED jumper cable.jpg
  • supercool joint.jpg
  • LED stick lamps.jpg
  • Lumileds LUXEON Altilon.jpg
  • led dragonfly.jpg
  • Osram LED 40W replacement bulb.jpg
  • LED solar lamp.jpg
  • topless oled desk lamp.jpg
  • LED message boards.jpg
OpenID accepted here Learn more about OpenID
Powered by Movable Type 4.31-en

Subscribe

Search

Tag Cloud

Archives

Categories

Recent Comments

  • Alun Williams - Electronics Weekly.com on LED Dragonfly street lighting, with camera: Doh! read more
  • Dr Bob on LED Dragonfly street lighting, with camera: Puts a whole new meaning to the phrase "I think read more
  • Alun Williams - Electronics Weekly.com on Supercool LED stick lights: Purely subjective view, Rob. Just don't see what the 'stickness' read more
  • rob gillatt on Supercool LED stick lights: Why won't they catch on? read more
  • Ryan on How to choose an LED for lighting: I'm shopping for a PAR38 dimmable LED lightbulb that is read more
  • John on Project TOPLESS lights up OLED desk lamp: This is the future of lighting, especially if efficiency of read more
  • Jason on World's first liquid-cooled LED light bulb?: Hi, These Hydralux-4 bulbs are really nice, and the 360 read more
  • Dan Aquinas on What's the big deal with LED traffic lights?: Regarding "A Buit"'s June 12th posting . . . It's read more
  • Dave McInnes on Poll: What type of LEDs do you use in your design?: couldn't beat them for lumen output or ease of heat read more
  • A Buit on What's the big deal with LED traffic lights?: This is pretty cool. There was a neat school project read more

Sign up for LED newsletter

We are planning to launch an LED newsletter in the not-too-distant future, so please sign up now to record your interest. Simply tick the option for OLED content.

Author Profiles

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.

Alistair Winning
Since graduating in Electronic Systems from the University of Paisley in 1997, Alistair has worked in the electronics design publishing industry. He has held various jobs in both journalism and PR/marketing including editor of Electronic Engineering Design and Embedded Systems Engineering and Account Manager at JDK Marcom. He is now working as Editor for Premier Farnell and recently launched its in-house technical magazine, Technology First.

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.

Blog Roll


Electronics Weekly Blogs

About this Archive

This page is an archive of recent entries in the Colour category.

beacon is the previous category.

Displays is the next category.

Find recent content on the main index or look in the archives to find all content.