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most recent messages 6/19/2013 11:52:22 PM Randolph M. Fritz D'oh! You're right, of course. This is apparently work done after the dissertations of both researchers. blog roll message boards chat Bees Like LED Grow Lights Keith Dawson, Editor-in-Chief, 6/20/2013 Comment now Solid state lighting has shown that it can aid photosynthesis and plant growth. Now we know it can help plant pollinators, too. Cartoon: LED Down the Garden Path Barney Walker, Cartoonist, 6/20/2013 Comment now [Please say hello to Barney Walker, the latest addition to our growing community of folks steeped in the LED lighting scene. We all have diverse viewpoints on this scene, and Barney's perspective may be a bit more diverse than most. Go read Barney's bio -- it will make your day -- then introduce yourself in the comments. -- Ed.] Silicon Nanoparticle LED Phosphors Keith Dawson, Editor-in-Chief, 6/19/2013 Comment now 6 comments Startup LumiSands is developing phosphors from silicon nanoparticles, hoping eventually to replace the rare earths now widely used in LED phosphors with materials based on cheaper, greener, and abundant sand. Most recent post, Randolph M. Fritz, 6/19/2013 11:52:22 PM D'oh! You're right, of course. This is apparently work done after the dissertations... How LEDs Got the Blues Alfred Poor, Speaker & Author, 6/19/2013 Comment now 2 comments The vibrant SSL industry we know today became possible only after the long-sought blue LED became a reality. Most recent post, bjcoppa, 6/19/2013 6:58:12 PM The formation of p-type GaN occured in 1993 which led to blue LEDs. Recently, p-ZnO... Wrinkles in Upgrading Street Lighting Keith Dawson, Editor-in-Chief, 6/18/2013 Comment now 7 comments Everyone agrees that saving electricity is good. But towns and the utilities that serve them may not see eye-to-eye when it comes to upgrading the street lighting. Most recent post, kdawson, 6/19/2013 9:12:59 PM But I do have to wonder what municipality negotiated a "tarriff" instead of an energy... AC LEDs Ron Lenk, LED Driver Consultant, 6/18/2013 Comment now 7 comments Trick question: What are the characteristics of a driver that would work best for a "driverless" AC LED? Most recent post, kdawson, 6/18/2013 10:46:06 PM However, companies have not formally announced products with changes in device architecture... Monday Roundup: Lighting a Castle Keith Dawson, Editor-in-Chief, 6/17/2013 Comment now 7 comments This week: Be careful with claims of a 50,000-hour lifetime, a campaign to retain incandescent lighting for theaters, and a video introduction to LEDs. Most recent post, Ron Amok, 6/19/2013 10:24:12 PM Read a real estate purchase contract. Fixtures remain with the house. The legal... Illumination & Other Nits Bill Reisenauer, Co-Founder, LED Specialists, 6/17/2013 Comment now 8 comments When we talk about light, let's use terms that are amenable to measurement. Most recent post, Bill Reisenauer, 6/19/2013 12:52:07 PM I heard a lot of good reviews of the ZEMAX software. Indeed, Moore's law,... A Biased Look at the Prospects for Sapphire Keith Dawson, Editor-in-Chief, 6/14/2013 Comment now 6 comments The substrate provider Rubicon Technology has released a sponsored white paper that paints a rosy picture of sapphire's prospects, while slighting the competitive technologies. Most recent post, kdawson, 6/18/2013 9:19:08 AM Ron, I declare you the unopposed winner of the clever title award. Soraa's... Light Guide Technology Enables SSL Keith Dawson, Speaker & Author, 6/14/2013 Comment now 5 comments Meet a company that is expert at moving light around and putting it just where its designers want it to be. Most recent post, bjcoppa, 6/18/2013 9:39:15 PM This is one area of light fixture design that does not get much attention. Most... LEDs & Sustainability Keith Dawson, Editor-in-Chief, 6/13/2013 Comment now 5 comments Sustainia spotlights 100 companies or projects, worldwide, each year that exemplify sustainability in action. LEDs feature prominently on this year's list. Most recent post, kdawson, 6/14/2013 9:53:47 AM I happened to be researching this post from the waiting room of a hosital as my... Next 5 blogs + All blogs All blogs most commented 8 Illumination & Other Nits Bill Reisenauer, Co-Founder, LED Specialists, 6/17/2013 7 Monday Roundup: Lighting a Castle Keith Dawson, Editor-in-Chief, 6/17/2013 7 AC LEDs Ron Lenk, LED Driver Consultant, 6/18/2013 7 Wrinkles in Upgrading Street Lighting Keith Dawson, Editor-in-Chief, 6/18/2013 6 A Biased Look at the Prospects for Sapphire Keith Dawson, Editor-in-Chief, 6/14/2013 blog roll message boards chat 6/19/2013 11:52:22 PM Re: (Not) The Paper: D'oh! You're right, of course. This is apparently work done after the dissertations of both researchers. Randolph M. Fritz on Silicon Nanoparticle LED Phosphors 6/19/2013 10:24:12 PM Re: warranty : Read a real estate purchase contract. Fixtures remain with the house. The legal question then becomes: at what lifetime does a maintained-by-replacement component become a fixture that is replaced as failure or wearout of an asset? Ron Amok on Monday Roundup: Lighting a Castle 6/19/2013 10:20:56 PM Re: Not too bright, is it?: LED lighting's shortfall - it has no carbon sequestration process, as was the case with those tar-dipped torches and serfs. Ron Amok on Monday Roundup: Lighting a Castle 6/19/2013 9:26:12 PM Re: (Not) The Paper: Looks like an interesting paper, but cadmium telluride quantum dots on induim tin oxide isn't what LumiSands is all about. kdawson on Silicon Nanoparticle LED Phosphors 6/19/2013 9:15:06 PM Re: "Monotonic": the definition is somewhat different than you say. "Monotonic" in this context refers to the idea that the lights should never get dimmer when the user turns them up. What I said: "monotonic: no sudden jumps in brightness while dimming and... kdawson on What We Mean by Dimming 6/19/2013 9:12:59 PM Re: Not enough light: But I do have to wonder what municipality negotiated a "tarriff" instead of an energy bill. The article mentioned that the tariffs are set at the state level. So there's some kind of residual regulation going on, in local pockets, after... kdawson on Wrinkles in Upgrading Street Lighting 6/19/2013 7:26:29 PM salutations: This is my last hurrah on ALL LED Lighting before signing off permanently. No more articles or comments for me. It was a roller coaster ride which came to a screeching hault, all of a sudden. Hope to see more technology articles of this sort... bjcoppa on Elevated Green LED Light Output via Strain Engineering 6/19/2013 7:15:17 PM The Paper: Chang-Ching Tu, Lih Y. Lin. "Thin film photodiodes fabricated by electrostatic self-assembly of aqueous colloidal quantum dots." Thin Solid Films, Volume 519, Issue 2, 1 November 2010, Pages 857–862. http://dx.doi.org/10.1016/j.tsf.2010.08.141. Electronic... Randolph M. Fritz on Silicon Nanoparticle LED Phosphors 6/19/2013 7:12:47 PM nanotech for Si: Nanotech LEDs regarding Si may be more promising since it offers the best of both worlds- low cost raw materials and high performance. The low cost is due to the beneficial economy of scale for Si substrates and established supply chain, and... bjcoppa on Aledia's 3D GaN-on-Si Microwire LEDs 6/19/2013 7:05:25 PM Re: nanotech : I think this is great, as Dennis says, that we have fresh, young minds exiting good universities that want to do something in the field. On the other hand, being innundated with university PR all the time, I've learned to take it with... eafpres on Silicon Nanoparticle LED Phosphors 6/19/2013 7:03:24 PM Re: OLED potential: Glad to see the lack on comments on this one. OLEDs deserve a spot in the limelight. One cannot throw the baby out with the bathwater. Not every technology is meant to solve all problems and be an end-all winner. If one display technology won... bjcoppa on Prospects for OLED Lighting 6/19/2013 7:00:18 PM Re: Side note on journal access: My usual solution to this is to go to my friendly neighborhood academic library and download it there. Randolph M. Fritz on Quantum Dot LEDs Next 5 messages + All messages All messages blog roll message boards chat 5/30/2013 2:12:15 PM Chat with color scientist Rachel Schwen: The original work is actually two decades old. There's a Wikipedia article: https://en.wikipedia.org/wiki/Photosensitive_ganglion_cell. As with any Wikipedia article, treat it as a place to start research, not to end it. Randolph M. Fritz Blogger 5/30/2013 2:08:38 PM Chat with color scientist Rachel Schwen: Keith - There was a well done, informative seminar on the topic a few hours ago ! Dm Dennis McCarthy Blogger 5/30/2013 2:06:44 PM Chat with color scientist Rachel Schwen: I will need to try to track it down. I heard in Paris last month at the CIE meetings and symposium in honor of the contribution of Yves Le Grand. They did not publish the proceedings. DCRich Photon 5/30/2013 2:06:20 PM Chat with color scientist Rachel Schwen: Thanks, Randolph. kdawson Editor 5/30/2013 2:05:32 PM Chat with color scientist Rachel Schwen: The keyword for that is "internally photosensitive retinal ganglion cells" or ipRGCs. Just enter in Google, you'll get tons of stuff. Randolph M. Fritz Blogger 5/30/2013 1:57:20 PM Chat with color scientist Rachel Schwen: We now know that there are a 5th set of light sensors in the retina that do not sense images but only the quality of the lighting. DCRich, fascinating, I had not heard about this. Link? kdawson Editor 5/30/2013 1:57:12 PM Chat with color scientist Rachel Schwen: Thanks for the great discussion, and for including me in your community! RachelSchwen Photon 5/30/2013 1:56:10 PM Chat with color scientist Rachel Schwen: Rachel, again, All LED Lighting thanks you!! kdawson Editor 5/30/2013 1:55:42 PM Chat with color scientist Rachel Schwen: Alright last call. I'll be going back to my paint world shortly... RachelSchwen Photon 5/30/2013 1:54:46 PM Chat with color scientist Rachel Schwen: Thanks! Randolph M. Fritz Blogger Next 5 chats +		flash poll All polls information resources sponsored content by Philips Lumileds Architectural Lighting - Energize your venue with vivid colors Downlights - Durable and effective LEDs you rely on High Bay and Low Bay Lighting - Energy saving LEDs for more productive environments Indoor Area Lighting - Brings confidence and a contemporary look to your lighting design You make lamps. We’ll make your lamps shine Outdoor Lighting - Creating a brighter and safer world Spotlights - Create the impact and intensity that sells LUXEON 3535L Infographic LUXEON S Infographic Brochure – Retail & Hospitality All resources follow us on twitter Follow us like us on facebook

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