Bread Crumb Menu
-
You are in:
- Home
- Components
- Displays and Opto
Monday 8 September 2008
Components
Latest News
|NewsletterDisplays and Opto
Lumileds pushes white LED efficiency higher
by Steve Bush
Wednesday 4 April 2007
Lumileds is back in the white LED efficiency race, following a year when Cree and Seoul Semiconductor seemed to pull out a solid lead.
Dubbed Rebel, and available in all standard LED colours, the cool and neutral whites’ can be specified at 70 lm/Wmin.
With this product the firm has gone for finer intensity and colour binning, something that Cree has been praised for. “We have never done bins this narrow before,” Lumileds spokesman Steve Landau told EW.
Interestingly, the firm is binning for minimum intensity rather than typical intensity - apparently after discussions with customers. “Not all LEDs are at the typical brightness,” said Landau. “By binning with minimum brightness, you know what’s the lowest performance you can expect.”
The device is tiny: 2.1mm high with a 4.5x3mm footprint. “At this size you can do RGB pixel displays,” said Landau.
Devices are available in cool white (6,500K), neutral white (4,100K), warm white (3,000K), royal blue, blue, cyan, green, amber, red-orange and red - but not all at 80 lm/Wmin.
Having frustrated some potential customers by delivering some variants of its K2 power LED a long time after announcing them, the firm has ensured supplies, or at least samples, of all Rebel devices exist.
“We have made sure there is some of everything on the shelf,” said Landau. “They are in stock at Future worldwide.”
The important cool white is amongst the stocked items, whereas warm white and neutral white are only sampling.
The brightest cool and neutral whites are both specified to make at least 80 lm at 350mA, and will typically hit 145 lm at 700mA.
Maximum specified current is 1A for the InGaN devices and 700mA for AlInGaP die.
“When total light output needs to be maximized, Rebel delivers more than 160 lm at higher drive currents,” said Lumileds.
As with other manufacturers, warm white efficiency is somewhat lower. “This is not a unique situation, there is more phosphor for the photons to pass through,” said Landau.
Dubbed Rebel, and available in all standard LED colours, the cool and neutral whites’ can be specified at 70 lm/Wmin.
With this product the firm has gone for finer intensity and colour binning, something that Cree has been praised for. “We have never done bins this narrow before,” Lumileds spokesman Steve Landau told EW.
Interestingly, the firm is binning for minimum intensity rather than typical intensity - apparently after discussions with customers. “Not all LEDs are at the typical brightness,” said Landau. “By binning with minimum brightness, you know what’s the lowest performance you can expect.”
The device is tiny: 2.1mm high with a 4.5x3mm footprint. “At this size you can do RGB pixel displays,” said Landau.
Devices are available in cool white (6,500K), neutral white (4,100K), warm white (3,000K), royal blue, blue, cyan, green, amber, red-orange and red - but not all at 80 lm/Wmin.
Having frustrated some potential customers by delivering some variants of its K2 power LED a long time after announcing them, the firm has ensured supplies, or at least samples, of all Rebel devices exist.
“We have made sure there is some of everything on the shelf,” said Landau. “They are in stock at Future worldwide.”
The important cool white is amongst the stocked items, whereas warm white and neutral white are only sampling.
The brightest cool and neutral whites are both specified to make at least 80 lm at 350mA, and will typically hit 145 lm at 700mA.
Maximum specified current is 1A for the InGaN devices and 700mA for AlInGaP die.
“When total light output needs to be maximized, Rebel delivers more than 160 lm at higher drive currents,” said Lumileds.
As with other manufacturers, warm white efficiency is somewhat lower. “This is not a unique situation, there is more phosphor for the photons to pass through,” said Landau.
Site Navigation
Blogs on EW
Mannerisms
Chip industry musings from David Manners
Electro-RamblingsEW website blog, highlighting new content and features
Gadget FreakBuild ingenious inventions, win £250
Made by MonkeysAnalysis of bad designs
Parallel LinesNews and analysis on parallel processing
Directive DecoderGary Nevison on industry legislation
UK Tech StartupsNews on funding for electronics startups