Cree ups lumens/Watt AND lumens/dollar with new LEDs
Hot on the heels of last month’s introduction of the XB-D LED technology platform, Cree today is introducing the XT-E series of high-brightness white LEDs.
The XB-D series is optimized for price as well as performance, delivering twice the lumens per dollar of other LEDs. Today’s introduction, the XT-E LED, more than doubles the lumens per watt (LPW) of Cree’s existing XLamp XP-E LED family, providing up to 148 LPW at 85°C (or up to162 LPW at 25°C) in cool white (6000 K); or up to 114 lumens per watt in warm white (3000 K) at 85°C, both at 350 mA. As with the XB-D series, the company says the new series delivers twice the lumens-per-dollar of other LEDs, and the XT-E series features the highest performance and efficacy in the industry.
The XT-E LED uses the same 3.45mm x 3.45mm footprint of the XP family so that designers can incorporate the XT-E LED in existing XP LED designs to shorten the LED fixture design cycle and improve customer time-to-market. Additionally, since the XT-E White LED is a successor product to XP-E High Efficiency LED, the application for ENERGY STAR qualification requires only 3000 hours of XT–E LED LM-80 data, instead of the normal 6000 hours.
KeithD commented:
The figure is 1/683 watts, not 1/83. This is the total power, not per sterad, and must be adjusted to account for the efficiency of the human eye at different wavelengths.
John B commented:
The definition of a lumen is 1/83rd of a Watt (of light) appearing across a steradian. Thus 1 Watt can yield 83 Lumens if the conversion is 100% efficient. So the claim of 148 lm/W seems to disregard the physics... What is Cree's definiton of a lumen?
William Ketel commented:
I am quite impressed with the Cree company, and I hope that they can keep up the progress. Now here is a question, which is about replacing failed backlights in flat screen monitors with an LED array. The color rendering would not need to be perfect, but heat generation would be a big consideration. Running a high output LED at much less than rated power seems like a good way to reduce the heat, but I have not tried it yet.
BobM commented:
One critical parameter that needs to be improved before there is widespread acceptance of LED lighting is the CRI (Color Rendering Index). This number is typically not published, possibly because very few manufacturers are able to produce LED solutions with a decent CRI. For accectance as a replacement for incadescent lighting, the CRI must be at least 90. Walk into your local bulding supply store and pull out your wallet's family photo and you'll see what I mean. Imagine the home decorator who walks into the living room and sees the "new look". Today's LED lights will be relaced with the former incadescents immediately!
CW commented:
I think J Engineer wanted to post to the other article today.
Jay commented:
What a great company! Cree keeps pushing the lumens/watt barrier and price/lumen barrier and the stock price keeps falling too. lol
Andy T commented:
It's not very bright to post non-topical stuff here, "J Engineer".
That said, it's good to see an AMERICAN company up the bar and continue its brilliant leadership in HBLEDs. Nice work, Cree!
J Engineer commented:
Last I heard the law of supply and demand still works. If the Demand for more STEM types is high price of STEMees will increase. Hence, more candidates will be attracted to the STEMee world.
But allas, STEMees are to first to be laid off, when times are stuff.
Young people unless you have an overpowering devotion to "The ART", think acccounting, business, marketing, Medicine, law. The money ain't a here!!!! But then you know that already don't you?
