Luxeon LEDs brings consistent color to enclosed lighting apps
The LED industry continues its push to make designing with LEDs as light sources as simple as possible. Historically, one complexity of selecting white LEDs for solid-state lighting has been the need for manufacturers to sort LEDs into “bins” based on variations in their color temperature. Rather than guaranteeing the LED was a certain color, the manufacturer was guaranteeing that its color would fall within a certain range.Three years ago Philips Lumileds introduced its Lumiramic phosphor technology which allowed it much greater control over LED color temperature, effectively eliminating the need for binning in some applications.Philips manufacturing process matches a Lumiramic ceramic phosphor plate with a thin-film flip chip (TFFC) die. The blue TFFC die has been characterized by wavelength, allowing it to match to the pre-measured Lumiramic phosphor.
The first Lumiramic-based LEDs went into automotive applications. Today Philips Lumileds announced white Luxeon Rebel LEDs for indoor illumination applications like recessed lamps, where high operating temperatures can cause a color shift over operating temperature. They have a typical efficacy of 80 lumens per watt and up to 95 lumens per watt at 350 mA and 3000K CCT, with consistent efficacy across the typical operating temperature range.What about non-typical operating temperatures? LEDs are typically tested at 25°C but in applications like down lights, which are enclosed, the internal temperature can be as high as 80°C-100°C. The new LUXEON Rebel emitters maintain more than 90% of their light and more than 95% of their datasheet efficacy at junction temperature of 85°C.
More info at: www.philipslumileds.com and www.futurelightingsolutions.com
hlee commented:
i think andy T, that your submission proves your point. i think you meant to post that to the Coin Cell battery forum .. and its babies that are of concern .. those are usually prestupid and not responsible for what they eat.
Confused commented:
If you compare the new and old part specs, all that changed is the binning structure. They used to have 4 bins inside the ANSI bin, but now have 16 bins. A strange coincidence that this 16 bin arrangement now matches Cree's binning structure.
Sadly, what went unchanged is the fine print that appears below the X/Y coordinate table; it still shows that their tester tolerance remains +/- 0.005 Therefore, they are no more capable of better color consistency, than before. They are just binning tighter.
Dave Light commented:
I have asked Lumileds for data on colour-vs-temperature and colour-vs-current, such as Osram data has.
The updated DR06 (Rebel LM80 test chart) has added a nice graph of colour-vs-hours on the last page.
BTW, as an LED product designer, I find that the Rebel Illumination series has by far the best high temperature performance, with 93% output at 100C vs 86% for most other brands.
Best regards, David.
Engineer commented:
Andy T, you are a retard.
Andy T commented:
Let's try that one again...
The story started about high temperature color shift, then drifted off in spades to efficacy, which admittedly is good for a 3000K device. Margery, since they are getting some free press from you, please ask LumiLEDs what the color shift over time at 100C (downlights) is on this technology....have THEM finish their story on color shift for your readers.
Andy T commented:
rats....
Andy T commented:
The bleedin hearts (..and esophagi) aren't going to like this, but Darwinism only works if you get 'em young and before they have a chance to reproduce - stupid parenting counts and is a fine way to eliminate those parental genes, assuming they don't go off and make another one that will OD on heroine 16 years after older brother, BatteryBoy, died.
The old people were demented and pill popping, so they were going to go soon anyway - a good thing if you've priced nursing home rates lately....I mean, who takes silver pills (mind you the packaging is the deceptive part, not the battery itself, and the blisterpak equipment is probably borrowed from pharma)?
Before I get accused of being totally heartless and for those who think I was being serious, yes, accidents do happen and they are both sad and unfortunate. Since we are somehow bent on allowing the stupid in this society to reproduce (and it seems they have no problem doing so by the half dozen at the drop of a hat, while those who deserve to pass their genes on have to resort to expensive in vitro means), are we going to now legislate an integrated ph detector that shuts down the battery?
FWIW, Duracells are more tasty than Maxells.
