Comments on: Cree to Obsolete The Light Bulb? http://leddev.wordpress.com/2007/09/07/cree-to-obsolete-the-light-bulb/ Linking engineers, developers, marketers, manufacturers, and consumers of LEDs and LED products. Thu, 22 Oct 2009 18:47:51 +0000 http://wordpress.com/ hourly 1 By: Department of Energy Finalizes Energy Star Requirements for Solid-State Lighting « Architectural Lighting Blog http://leddev.wordpress.com/2007/09/07/cree-to-obsolete-the-light-bulb/#comment-19 Department of Energy Finalizes Energy Star Requirements for Solid-State Lighting « Architectural Lighting Blog Mon, 17 Sep 2007 16:59:32 +0000 http://leddev.wordpress.com/2007/09/07/cree-to-obsolete-the-light-bulb/#comment-19 Hey! The DOE issued it's final Energy Star criteria for SSL products effective 30SEPT2007! Shoot on over to my <a href="http://archlight.wordpress.com/2007/09/17/department-of-energy-finalizes-energy-star-requirements-for-solid-state-lighting/" rel="nofollow">Architectural Lighting Blog</a> to read the whole story and get a copy of the requirements! Hey! The DOE issued it’s final Energy Star criteria for SSL products effective 30SEPT2007! Shoot on over to my Architectural Lighting Blog to read the whole story and get a copy of the requirements!

]]> By: Architectural Lighting Asks, “What will be the fate of the incandescent lamp?” « Architectural Lighting Blog http://leddev.wordpress.com/2007/09/07/cree-to-obsolete-the-light-bulb/#comment-17 Architectural Lighting Asks, “What will be the fate of the incandescent lamp?” « Architectural Lighting Blog Thu, 13 Sep 2007 14:05:57 +0000 http://leddev.wordpress.com/2007/09/07/cree-to-obsolete-the-light-bulb/#comment-17 Fly on over to my <a href="http://archlight.wordpress.com/2007/09/13/architectural-lighting-asks-what-will-be-the-fate-of-the-incandescent-lamp/" rel="nofollow">Architectural Lighting Blog</a> to read my thoughts (thanks for the great input Jim!) on the future of the light bulb Fly on over to my Architectural Lighting Blog to read my thoughts (thanks for the great input Jim!) on the future of the light bulb

]]> By: craigbic http://leddev.wordpress.com/2007/09/07/cree-to-obsolete-the-light-bulb/#comment-16 craigbic Mon, 10 Sep 2007 14:21:03 +0000 http://leddev.wordpress.com/2007/09/07/cree-to-obsolete-the-light-bulb/#comment-16 Well, that's a good point and I'm sure that it's not terribly economical to produce or to practical to cool, even if the chip is that large. However, It's real positive press and they've been making a lot of that lately and they want to keep doing that. Osram recently announced record breaking output from red and green LEDs so I'm sure that had no small part in the decision to release the story now. Also, their stock was down to $15.47 at the end of January 2007 and looking at the bigger picture they seem to have leveled off since 2000/2001 so with the rise by 10% from about $24 up to about $27on the rumor that GE could buy them out, they could just be looking to start a trend. Well, that’s a good point and I’m sure that it’s not terribly economical to produce or to practical to cool, even if the chip is that large.

However, It’s real positive press and they’ve been making a lot of that lately and they want to keep doing that. Osram recently announced record breaking output from red and green LEDs so I’m sure that had no small part in the decision to release the story now. Also, their stock was down to $15.47 at the end of January 2007 and looking at the bigger picture they seem to have leveled off since 2000/2001 so with the rise by 10% from about $24 up to about $27on the rumor that GE could buy them out, they could just be looking to start a trend.

]]> By: Jim Allen http://leddev.wordpress.com/2007/09/07/cree-to-obsolete-the-light-bulb/#comment-15 Jim Allen Mon, 10 Sep 2007 13:33:59 +0000 http://leddev.wordpress.com/2007/09/07/cree-to-obsolete-the-light-bulb/#comment-15 Craig, Cree says that it usually takes about a year from a laboratory demonstration to a production product. This announcement says 12-24 months, suggesting that the lead time will be longer than usual. Why spill the beans so soon? Could it be that a chip as large as 2mm**2 is not economical on 2" (sapphire) wafers and Cree is doing some trash talking? Jim Craig,

Cree says that it usually takes about a year from a laboratory demonstration to a production product. This announcement says 12-24 months, suggesting that the lead time will be longer than usual. Why spill the beans so soon? Could it be that a chip as large as 2mm**2 is not economical on 2″ (sapphire) wafers and Cree is doing some trash talking?

Jim

]]> By: craigbic http://leddev.wordpress.com/2007/09/07/cree-to-obsolete-the-light-bulb/#comment-14 craigbic Sun, 09 Sep 2007 00:03:26 +0000 http://leddev.wordpress.com/2007/09/07/cree-to-obsolete-the-light-bulb/#comment-14 I forgot to mention in my last post: The more interesting thing about this achievement is not the light output but the incredible efficacy from the LED. I forgot to mention in my last post:

The more interesting thing about this achievement is not the light output but the incredible efficacy from the LED.

]]> By: craigbic http://leddev.wordpress.com/2007/09/07/cree-to-obsolete-the-light-bulb/#comment-13 craigbic Sun, 09 Sep 2007 00:02:37 +0000 http://leddev.wordpress.com/2007/09/07/cree-to-obsolete-the-light-bulb/#comment-13 Well, considering that cooling 350 mA devices is a challenge (heat-sinking is required for these) and when you overdrive those 350 mA devices up to 750 mA or when you run 1 Watt, 750 mA devices the heat is intense and active cooling is often employed, one can only imagine the heat generated by a 4 amp device. While one can imagine many ways to cool such a device, how many of those ways are commercially practical? The engineering isn't in question. Well, considering that cooling 350 mA devices is a challenge (heat-sinking is required for these) and when you overdrive those 350 mA devices up to 750 mA or when you run 1 Watt, 750 mA devices the heat is intense and active cooling is often employed, one can only imagine the heat generated by a 4 amp device. While one can imagine many ways to cool such a device, how many of those ways are commercially practical? The engineering isn’t in question.

]]> By: Jim Allen http://leddev.wordpress.com/2007/09/07/cree-to-obsolete-the-light-bulb/#comment-12 Jim Allen Sat, 08 Sep 2007 17:16:30 +0000 http://leddev.wordpress.com/2007/09/07/cree-to-obsolete-the-light-bulb/#comment-12 Craig, This prototype probably uses a 2mm*2 chip. Swoboda made a comment during the Aug07 CC that the size of lighting LED die would vary from as large as 2mm squared to 200 microns squared. This will probably become an EZB2000 chip. This is a 14watt device at 3.5V. Is cooling a 14watt device really such a big engineering challenge? Jim Craig,

This prototype probably uses a 2mm*2 chip. Swoboda made a comment during the Aug07 CC that the size of lighting LED die would vary from as large as 2mm squared to 200 microns squared. This will probably become an EZB2000 chip.

This is a 14watt device at 3.5V. Is cooling a 14watt device really such a big engineering challenge?

Jim

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