Lumileds said:
Here we go again, I'll take four please sir!! Official press release here. Discuss… :thumbsup:Lumileds said:
Dave.
Lumileds said:San Jose, California - Philips Lumileds, the pioneer and the leader in high-power LED technology, announced today new performance records for high-power white LEDs. Philips Lumileds 1x1 mm2, chip based white LEDs, operating at just 350 mA, delivered 136 lumens for a light source efficiency of 115 lumens per Watt at a correlated-colour temperature (CCT) of 4685K. At 2000 mA, Philips Lumileds white LEDs delivered 502 lumens at a corresponding 61 lumens per Watt. These LEDs are the first high-power LEDs to break through the 100 lumen per Watt mark and demonstrate the real potential of solid state lighting technology.
Here we go again, I'll take four please sir!! Official press release here. Discuss… :thumbsup:Lumileds said:Philips Lumileds achieved the record results for white LEDs by combining several new and innovative technologies it has developed. The first devices using these technologies will be introduced in a new generation of products during this quarter. These new technologies will continue to proliferate in new, and existing, products throughout the next 12-18 months.
Philips Lumileds breakthroughs in epitaxy, device physics, phosphor, and packaging technologies are critical to delivering the performance required of LEDs as they continue their growth into a preferred light source.
Time will tell, but lumen maintenance of Lumiled products at their rated drive currents has been excellent historically. It will be interesting to see how this new technology will be packaged. Perhaps implementation into existing products will see drive currents lowered a little, but I am sure Lumileds will have a package developed that can cope with the demands of this extra power.presslab said:Now the question is can they get the heat out of it.
I think everyone assumed that Lumileds would be working on something while the other manufacturers had their glory for a while. It could even have been a delayed release so that they could make the most of the market with their current range before releasing a new product. Their claimed release time frame certainly looks like that to me.Allen said:I don't thing anyone really thought Lumileds would be down for the full count! This race will be going on forever.
Which is exactly the problem - at the moment this is just vaporware, and given the history I'm not about to get excited until they at least announce production products, or even until they actually appear at distributors.Low_Rider said:Hopefully we will see something tangible soon, I don't want to go through the waiting game we had with the K2 again…
They might be more efficient than previous generations, but given the overall efficiency of turning electrical power into light, the vast majority is still going out in heat - I'd guess that you probably still have 80-90% of the heat output of a Lux 3, so the thermal management issues haven't changed that much. Certainly if you want to get anywhere near the figures you're seeing there, you will still need very good heatsinking (given that I'd imagine they are keeping the die to 25 degrees by supercooling the slug for those tests).in terms of lumen per watt and the increase in efficiency, the emitter should actually be producing less heat per watt.
I would assume these lumen spec's are 25 C die as well, as the previous products are spec'd that way. I believe they just quickly pulse the LED on and measure the light output before it has a chance to heat up.chrism said:(given that I'd imagine they are keeping the die to 25 degrees by supercooling the slug for those tests).
I agree, the color sounds really good as long as the tint isn't weird. A less sterile light would work great on the trails.presslab said:The low color temperature is great, I think ~5000 K looks the best to my eyes.
That's exactly the testing regime suggested on the thread over at CPF - I suspect whilst they can rate it at 2A it can't actually handle that much continuous current, so all the excitement over a 500lm emitter is a bit premature.presslab said:I would assume these lumen spec's are 25 C die as well, as the previous products are spec'd that way. I believe they just quickly pulse the LED on and measure the light output before it has a chance to heat up.
That's a little disappointing, really. It's kind of like weighing a bike without pedals or a saddle and proclaiming the lightest weight. Sure, it's light, but you can't actually ride it that way.chrism said:That's exactly the testing regime suggested on the thread over at CPF - I suspect whilst they can rate it at 2A it can't actually handle that much continuous current, so all the excitement over a 500lm emitter is a bit premature.
I don't agree. With the cost of LED emitters, IMHO you would always want to use multiple. This way you can mix optics, have a larger surface area that draws heat away, and multiple emitters at a lower current will be more efficient than less emitters driven harder. However, with 500lm from a single emitters I'd imagine you'd want to build a very small (single emitter), yet extremely powerfull light.James@GearReview said:That's a little disappointing, really. It's kind of like weighing a bike without pedals or a saddle and proclaiming the lightest weight. Sure, it's light, but you can't actually ride it that way.
In that case, prepare to be very satisfied right now. Take a currently available single 18650 with 2400mAh at 3.7V, you have 8.8Wh. Allowing for regulator losses that is enough to drive a currently available U-bin SSC P4 at 1A (~3.6W) for 2 hours or so. At 1A, that U-bin P4 should give out at least 200lm, so even allowing for 10% degradation due to not keeping it cool enough and a 90% efficient optic, that's still 160lm out the front. That's a real world 160lm actually hitting the stuff you want to look at and a real world 2 hour run time, and all with currently available components.Homebrew said:I think if they can get to the point where a single LED driven with a single 18650 Li-Ion cell for two hours with around 160 lumens (around the same as two T-bin Lux III), I would be very satisfied.
While I'm not going to believe it until I see it, I don't think we're all that far off running higher currents like 2 amps continuous. My basic understanding from what I have read and played round with is that the current limitations in most of the latest emitters are in the bond wires (current capacity) and packaging (thermal management) rather then the physical die itself.chrism said:I suspect whilst they can rate it at 2A it can't actually handle that much continuous current, so all the excitement over a 500lm emitter is a bit premature.
Solid State Lighting.net has also reported that a license agreement has been organised between Phillips and OSRAM.compoundsemiconductor.net said:According to Lumileds, the first commercial products to incorporate the enhanced device designs will be released before the end of March 2007, with many others set to follow over the next 18 months.
Cheers, Dave.sslighting.net said:OSRAM and Philips have signed cross license agreement covering optoelectronic semiconductors. The agreement involves the mutual licensing of patents for all inorganic and organic LED. "We expect this to put us in an even better position to use LED technology to serve the demands of the market," said Dr. Rudiger Muller, President and CEO of OSRAM Opto Semiconductors GmbH in Regensburg. The agreement relates to patents held by Philips, including the US subsidiary Lumileds, and by OSRAM including its subsidiary OSRAM Opto Semiconductors.
From a purely optical point of view, i'd have to respectfully disagree. With multiple point sources, you can get weird shadowing effects (although these are greatly diminished far field like we care about). Also multiple emitters won't give you a beam pattern a well designed single optic could (at least in the range of usable bike light). Multiple emitters translates into increased cost, weight, etc.Low_Rider said:I definitely agree with brum on most of his points though, particularly from an optical point of view of having more emitters to shape the light. :thumbsup:
I totally agree with you. In practice, it is not a big deal for bike lights. My experience comes from designing colour changing LED products with reds, greens, and blues. Then, the colour mixing and strange shadowing is a huge problem.achesalot said:Although one light, one optic is probably ideal, I've never had any difficulty getting what appears to be a single beam from a double or Triple LED design. I suppose if you went with some really tight beam optics or deep reflectors you might notice the separate emitters, but in practice, it's not that big of a deal. You really don't want those super-narrow, flashlight-lover kind of beams in a bike light IMHO.
Yes it's still just talk, but at least they haven't gone silent. :thumbsup:LED's Magazine dot com said:New Lumileds power LED is a small secret
11 Feb 2007
Lumileds will unveil a miniature power LED in a few weeks' time. Attendees of last week's LED4Europe event in Brussels got the briefest sneak preview of Philips Lumileds' latest power LED, which is certain to have a huge impact on the LED marketplace.
The performance characteristics of the device where not discussed, and Lumileds is keeping the name under wraps before the planned launch on March 1. However, the key feature of the device, containing a single 1x1 mm2 LED chip, is its very small size, only a fraction of the size of the Luxeon K2.
Key customers are evaluating the new device now. Unlike the K2 (which was announced a year before it was actually available), the new LED will be available immediately once the announcement is made.
It is doubtful but you would never know, Lumileds themselves have hinted that their new technology may be integrated into their existing product line in the long term:Y-Wrench said:It does sound like everyone's hope for a Luxeon compatible form factor may not happen.
Again it's only guess work, but you may eventually find the new die being incorporated into the old Luxeon packaging, but it would be likely that their specification would be quite different to their "new devices" that they will release in the future due to expected thermal and physical issues.Lumileds said:The first devices using these technologies will be introduced in a new generation of products during this quarter. These new technologies will continue to proliferate in new, and existing, products throughout the next 12-18 months.
This is exactly what I was hoping may happen in the future, I didn't expect it quite so soon though! This is one of the areas of white LED development that I thought would take a whole lot longer to see any real gains…Lumileds February 13 said:Philips Lumileds today announced it has fundamentally solved the problem of "droop", a phenomenon common to *********** LEDs in which efficacy (lumens per watt) decreases as current increases. The breakthrough, by the company's engineers and scientists, enables efficacy to continue to increase even as drive current increases.
The new technology will be implemented in 2007 in the company's LUXEON® LEDs which already deliver leading light output at drive currents of 1000mA and higher. Sampling of products is expected to begin in the next 90 days with full production in Q3 of 2007…
…Incorporating this new epitaxial technology will allow Philips Lumileds to deliver the industry's first high-power LEDs that deliver 70 or more lumens per watt at drive currents of 1000mA and higher.
This should make it easier for manufacturers to implement the new technology into existing products... if I read that right.Low_Rider said:How things can change… it looks like the old Luxeon package may see a bit of a boost sooner then I thought! :thumbsup:
Lumileds said:Philips employs approximately 121,700 employees in more than 60 countries worldwide. With sales of EUR 27 billion in 2006, the company is a market leader in medical diagnostic imaging and patient monitoring systems, energy efficient lighting solutions, personal care and home appliances, as well as consumer electronics.