Have I got an LED for you ... !!!
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Have I got an LED for you ... !!!
by Russell McMahon-3
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At the bottom of this page of Nichia LEDs
http://www.nichia.co.jp/de/product/led-lamp-flux.html you'll see an NSPWR70CS-K1. White LED, 7.62 mm square. 3.1 volt typical Vf at 50 mA. 20 lumen typical at 50 mA. (15.1 min to 25.5 max in 3 bins). Lessee. 20/(3.1x0.05) = 125+ lumens / Watt. Sounds of scraping chairs and stampeding feet. 140 lumens / Watt at 20 mA ! :-) 140 lumens / Watt at 20 mA ! :-) 140 lumens / Watt at 20 mA ! :-) 140 lumens / Watt at 20 mA ! :-) 140 lumens / Watt at 20 mA ! :-) 140 lumens / Watt at 20 mA ! :-) Unlike the others on the page there is no link to a data sheet. You can't buy this LED yet but you will be able to do so next month. Nichia have samples available. More scraping of chairs ... I have samples and a data sheet at my elbow as I type :-). Just arrived. Yet to try them. I'll let you know if they are as good as they sound. At this efficiciency about 1/3 of the total electrical input comes out the front as light ! (!!!!!!!!!!!!!!!!!!!) Things are getting good in the LED world. Russell -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist |
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Re: Have I got an LED for you ... !!!
by Stephen D. Barnes-2
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Russell wrote:
> At the bottom of this page of Nichia LEDs > > http://www.nichia.co.jp/de/product/led-lamp-flux.html > > you'll see an NSPWR70CS-K1. > White LED, 7.62 mm square. > 3.1 volt typical Vf at 50 mA. > 20 lumen typical at 50 mA. > (15.1 min to 25.5 max in 3 bins). > > Lessee. > > 20/(3.1x0.05) = 125+ lumens / Watt. > > Sounds of scraping chairs and stampeding feet. > > 140 lumens / Watt at 20 mA ! :-) > 140 lumens / Watt at 20 mA ! :-) > 140 lumens / Watt at 20 mA ! :-) > 140 lumens / Watt at 20 mA ! :-) > 140 lumens / Watt at 20 mA ! :-) > 140 lumens / Watt at 20 mA ! :-) > > Unlike the others on the page there is no link to a data sheet. > You can't buy this LED yet but you will be able to do so next month. > Nichia have samples available. > More scraping of chairs ... > > I have samples and a data sheet at my elbow as I type :-). > Just arrived. Yet to try them. > I'll let you know if they are as good as they sound. > > At this efficiciency about 1/3 of the total electrical input comes out the front as light ! (!!!!!!!!!!!!!!!!!!!) > Things are getting good in the LED world. > > > > Russell > -- Regards, Stephen D. Barnes -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist |
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Re: Have I got an LED for you ... !!!
by Apptech
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>> At the bottom of this page of Nichia LEDs
>> >> http://www.nichia.co.jp/de/product/led-lamp-flux.html >> >> you'll see an NSPWR70CS-K1. >> White LED, 7.62 mm square. >> 3.1 volt typical Vf at 50 mA. >> 20 lumen typical at 50 mA. >> (15.1 min to 25.5 max in 3 bins). >> 20/(3.1x0.05) = 125+ lumens / Watt. >> 140 lumens / Watt at 20 mA ! :-) > 7.62 mm eh? Sounds like the bullet of choice! Fraid not. That's per lineal edge so you'd need a sabot and a bore sqrt(2) larger. Then you'd get a truly embedded LED. R -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist |
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Re: Have I got an LED for you ... !!!
by Dario Greggio (in giro)
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Russell wrote:
> 140 lumens / Watt at 20 mA ! :-) > 140 lumens / Watt at 20 mA ! :-) > > Unlike the others on the page there is no link to a data sheet. > You can't buy this LED yet but you will be able to do so next month. > Nichia have samples available. How can we get samples?? :) -- Ciao, Dario -- ADPM Synthesis sas -- http://www.adpm.tk -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist |
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Re: Have I got an LED for you ... !!!
by Apptech
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>> 140 lumens / Watt at 20 mA ! :-)
>> 140 lumens / Watt at 20 mA ! :-) >> >> Unlike the others on the page there is no link to a data sheet. >> You can't buy this LED yet but you will be able to do so next month. >> Nichia have samples available. > > How can we get samples?? :) Mine came via Nichia USA. I could tell you the name of the very excellent sales rep I've been dealing with, but then he's probably have to kill me :-). If you inquired of your local Nichia sales office they would probably oblige, although offering to buy a million in the next while may help their enthusiasm. I imagine it will become a general market item as soon as they can get it so. Price was uncertain but his suggested range sounded reasonable. Hopefully this is a sign of where the market is going generally. Russell. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist |
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Re: Have I got an LED for you ... !!!
by Dario Greggio (in giro)
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Apptech wrote:
>>How can we get samples?? :) > > > Mine came via Nichia USA. I could tell you the name of the very excellent > sales rep I've been dealing with, but then he's probably have to kill me > :-). > > If you inquired of your local Nichia sales office they would probably > oblige, although offering to buy a million in the next while may help their > enthusiasm. :) yeah Where can I find the "contacts" ? I can't see them... -- Ciao, Dario -- ADPM Synthesis sas -- http://www.adpm.tk -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist |
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Re: Have I got an LED for you ... !!!
by Apptech
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>> If you inquired of your local Nichia sales office they would probably
>> oblige, although offering to buy a million in the next while may help >> their >> enthusiasm. > > > :) yeah > Where can I find the "contacts" ? > I can't see them... You could start by inquiring at: Nichia's primary website: http://www.nichia.com FOR SMALL QUANTITY PURCHASES, CONTACT INFO@.... Netherlands and Germany contacts here Italy not shown http://www.nichia.com/contact.html -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist |
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Re: Have I got an LED for you ... !!!
by Dario Greggio (in giro)
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Apptech wrote:
>>Where can I find the "contacts" ? >>I can't see them... > > > You could start by inquiring at: > > Nichia's primary website: http://www.nichia.com > FOR SMALL QUANTITY PURCHASES, CONTACT INFO@.... > > Netherlands and Germany contacts here Thank you Russell! (for some reason I did not see that). I would be interested in porting my RGB lamps to some higher power, at a reasonable price and with higher light emission than today. For my new home, actually, I modified the RGB-PWM circuit to make it drive neon-dimmer (1-10V) ... and this is of course a much cheaper solution, with R-G-B neon tubes :) -- Ciao, Dario -- ADPM Synthesis sas -- http://www.adpm.tk -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist |
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RE: Have I got an LED for you ... !!!
by Jack Krause
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Thanks much!
-----Original Message----- From: piclist-bounces@... [mailto:piclist-bounces@...]On Behalf Of Russell Sent: Sunday, September 07, 2008 5:07 PM To: PIC List Subject: [EE]:: Have I got an LED for you ... !!! At the bottom of this page of Nichia LEDs http://www.nichia.co.jp/de/product/led-lamp-flux.html you'll see an NSPWR70CS-K1. White LED, 7.62 mm square. 3.1 volt typical Vf at 50 mA. 20 lumen typical at 50 mA. (15.1 min to 25.5 max in 3 bins). Lessee. 20/(3.1x0.05) = 125+ lumens / Watt. Sounds of scraping chairs and stampeding feet. 140 lumens / Watt at 20 mA ! :-) 140 lumens / Watt at 20 mA ! :-) 140 lumens / Watt at 20 mA ! :-) 140 lumens / Watt at 20 mA ! :-) 140 lumens / Watt at 20 mA ! :-) 140 lumens / Watt at 20 mA ! :-) Unlike the others on the page there is no link to a data sheet. You can't buy this LED yet but you will be able to do so next month. Nichia have samples available. More scraping of chairs ... I have samples and a data sheet at my elbow as I type :-). Just arrived. Yet to try them. I'll let you know if they are as good as they sound. At this efficiciency about 1/3 of the total electrical input comes out the front as light ! (!!!!!!!!!!!!!!!!!!!) Things are getting good in the LED world. Russell -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist No virus found in this incoming message. Checked by AVG - http://www.avg.com Version: 8.0.169 / Virus Database: 270.6.18/1658 - Release Date: 9/7/2008 3:30 PM -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist |
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Re: Have I got an LED for you ... !!!
by Chris McSweeny
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Not hugely impressive, given
http://www.candlepowerforums.com/vb/showpost.php?p=2139614&postcount=127 shows test results from almost exactly a year ago (real ones, rather than manufacturer ideal conditions) of an LED which managed over 150lm/W at 20mA and 140lm/W at 50mA (oh and also still over 100lm/W at 300mA and 70lm/W at 1A!) That's also actually about half the electrical input power coming out the front as light given an ideal white source is only 243lm/W (the ideal for the spectrum of a white LED is presumably a bit higher than that, given the blue spike in the spectrum close to the eye's maximum efficiency). Chris On Mon, Sep 8, 2008 at 1:07 AM, Russell <newsletters@...> wrote: > At the bottom of this page of Nichia LEDs > > http://www.nichia.co.jp/de/product/led-lamp-flux.html > > you'll see an NSPWR70CS-K1. > White LED, 7.62 mm square. > 3.1 volt typical Vf at 50 mA. > 20 lumen typical at 50 mA. > (15.1 min to 25.5 max in 3 bins). > > Lessee. > > 20/(3.1x0.05) = 125+ lumens / Watt. > > Sounds of scraping chairs and stampeding feet. > > 140 lumens / Watt at 20 mA ! :-) > 140 lumens / Watt at 20 mA ! :-) > 140 lumens / Watt at 20 mA ! :-) > 140 lumens / Watt at 20 mA ! :-) > 140 lumens / Watt at 20 mA ! :-) > 140 lumens / Watt at 20 mA ! :-) > > Unlike the others on the page there is no link to a data sheet. > You can't buy this LED yet but you will be able to do so next month. > Nichia have samples available. > More scraping of chairs ... > > I have samples and a data sheet at my elbow as I type :-). > Just arrived. Yet to try them. > I'll let you know if they are as good as they sound. > > At this efficiciency about 1/3 of the total electrical input comes out the > front as light ! (!!!!!!!!!!!!!!!!!!!) > Things are getting good in the LED world. > > > > Russell > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist |
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Re: Have I got an LED for you ... !!!
by Apptech
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> Not hugely impressive, given
> http://www.candlepowerforums.com/vb/showpost.php?p=2139614&postcount=127 > shows > test results from almost exactly a year ago (real ones, rather than > manufacturer ideal conditions) of an LED which managed over 150lm/W at > 20mA > and 140lm/W at 50mA (oh and also still over 100lm/W at 300mA and 70lm/W at > 1A!) I'd say that the Jury is still out. The LED you quote is immensely impressive - and FIW its rated at 20 times the current of the one I mentioned so its in a different class.. The 20 mA above is 2% of the maximum rated current of the LED. in question which returned a creditable 98 l/W at 350 mA and 69 l/W at 1000 mA. Lumen efficincy rises with decreasing current so I'd suspect that at a small fraction of it's rated output the Nichia would perform better again. Maybe not. I'll be trying them at low current as well for a niche application so it will be interesting to see how they perform. My brain says that white light 100% efficincy is about 350 l/w but the figure may be wrong. Varies with colour due to eye response as lumen definition is eye response weighted. Russell > That's also actually about half the electrical input power coming out the > front as light given an ideal white source is only 243lm/W (the ideal for -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist |
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