Post by thread:[EE:] Lumileds Luxeon very high brightness LED mod

Luxeon LED illuminator site. Very well done. Copious technical information both on module characteristics and design, lifetime, operation ... http://www.lumileds.com/ For those who haven't met them, the Luxeon units offer outputs comparable with typical incandescent bulbs but with many advantages (high lifetime, good colour matching, high efficiency, bright well controlled beam pattern, ...). Applications include standard lighting (torches, car lights, ...) and specialist applications such as dental resin curing. Available in white plus arrange of colours and a number of output patterns and power levels. -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email spam_OUTlistservTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body

We use them in a few of our products. Pretty good stuff, and at the moment, they are the market leaders. There are a few companies trying to play catch-up who should be releasing similar LEDs soon. If you've got a free day and $250 to spend, attend one of the Lumileds seminars. They provide very good information about heat management, driving techniques, etc. Plus you get a golf shirt :) Josh -- A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. -Douglas Adams On Fri, 9 Jul 2004 01:14:36 +1200, Russell McMahon <.....apptechKILLspam@spam@paradise.net.nz> wrote: {Quote hidden}> Luxeon LED illuminator site. > Very well done. > Copious technical information both on module characteristics and design, > lifetime, operation ... > > http://www.lumileds.com/ > > For those who haven't met them, the Luxeon units offer outputs comparable > with typical incandescent bulbs but with many advantages (high lifetime, > good colour matching, high efficiency, bright well controlled beam pattern, > ...). Applications include standard lighting (torches, car lights, ...) and > specialist applications such as dental resin curing. > > Available in white plus arrange of colours and a number of output patterns > and power levels. -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listservKILLspammitvma.mit.edu with SET PICList DIGEST in the body

A word of caution: I ran into a peculiar situation with these super high brightness devices: they radiate an inordinate amount of RF when switched. My approach was to PWM the LEDs to control brightness, but it failed. Every LED radiates a tiny pulse when switching from non-emission to the emission states. But these big ones have such a huge wavefront that in a radio application once (2 years ago) I was unable to get the energy squashed enough for the radio to work. Simply had to abandon the design. The radiation was detectable by simple sniffer well into the 900Mhz band, highest freq my sniffer would capture. --Bob Russell McMahon wrote: {Quote hidden}> Luxeon LED illuminator site. > Very well done. > Copious technical information both on module characteristics and design, > lifetime, operation ... > > http://www.lumileds.com/ > > For those who haven't met them, the Luxeon units offer outputs comparable > with typical incandescent bulbs but with many advantages (high lifetime, > good colour matching, high efficiency, bright well controlled beam pattern, > ...). Applications include standard lighting (torches, car lights, ...) and > specialist applications such as dental resin curing. > > Available in white plus arrange of colours and a number of output patterns > and power levels. > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > email .....listservKILLspam.....mitvma.mit.edu with SET PICList DIGEST in the body > > -- Replier: Most attachments rejected -------------- Bob Axtell PIC Hardware & Firmware Dev http://beam.to/baxtell 1-520-219-2363 -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email EraseMElistservspam_OUTTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body

On Thu, 8 Jul 2004 07:07:55 -0700, you wrote: >A word of caution: > >I ran into a peculiar situation with these super high brightness >devices: they radiate an inordinate amount of RF when switched. >My approach was to PWM the LEDs to control brightness, but it failed. > >Every LED radiates a tiny pulse when switching from non-emission to the >emission states. But these big ones have such a huge wavefront that in a >radio application once (2 years ago) I was unable to get the energy >squashed enough for the radio to work. Simply had to abandon the design. >The radiation was detectable by simple sniffer well into the 900Mhz >band, highest freq my sniffer would capture. Is this due to the current spike or something else ? Why wouldn't a series inductor to control the risetime fix this? -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listservspam_OUTmitvma.mit.edu with SET PICList DIGEST in the body

I designed one of those special applications - a dental curing light. The lumiled LEDs are REALLY BRIGHT! Harold {Quote hidden}> Luxeon LED illuminator site. > Very well done. > Copious technical information both on module characteristics and design, > lifetime, operation ... > > http://www.lumileds.com/ > > For those who haven't met them, the Luxeon units offer outputs comparable > with typical incandescent bulbs but with many advantages (high lifetime, > good colour matching, high efficiency, bright well controlled beam > pattern, > ....). Applications include standard lighting (torches, car lights, ...) > and > specialist applications such as dental resin curing. > > Available in white plus arrange of colours and a number of output > patterns > and power levels. > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > email @spam@listservKILLspammitvma.mit.edu with SET PICList DIGEST in the body > -- FCC Rules Online at http://www.hallikainen.com -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email KILLspamlistservKILLspammitvma.mit.edu with SET PICList DIGEST in the body

Mike Harrison wrote: > On Thu, 8 Jul 2004 07:07:55 -0700, you wrote: > > >>A word of caution: >> >>I ran into a peculiar situation with these super high brightness >>devices: they radiate an inordinate amount of RF when switched. >>My approach was to PWM the LEDs to control brightness, but it failed. >> >>Every LED radiates a tiny pulse when switching from non-emission to the >>emission states. But these big ones have such a huge wavefront that in a >>radio application once (2 years ago) I was unable to get the energy >>squashed enough for the radio to work. Simply had to abandon the design. >>The radiation was detectable by simple sniffer well into the 900Mhz >>band, highest freq my sniffer would capture. > > > Is this due to the current spike or something else ? Why wouldn't a series inductor to control the > risetime fix this? I tried RF chokes of many values in series with the LED leads, tried improving the ground plane, caps, caps in combination with RF chokes, etc. Yes, it worked pretty well with a mu-metal shield surrounding the LED on every side except where the light came out. But it was too costly to manufacture. These noisy ones were made by HP. --Bob -- Replier: Most attachments rejected -------------- Bob Axtell PIC Hardware & Firmware Dev http://beam.to/baxtell 1-520-219-2363 -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email RemoveMElistservTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body

Did you measure the resonant frequency of these things? Sounds like they are little antennas... -Adam Bob Axtell wrote: {Quote hidden}> Mike Harrison wrote: > >> On Thu, 8 Jul 2004 07:07:55 -0700, you wrote: >> >> >>> A word of caution: >>> >>> I ran into a peculiar situation with these super high brightness >>> devices: they radiate an inordinate amount of RF when switched. >>> My approach was to PWM the LEDs to control brightness, but it failed. >>> >>> Every LED radiates a tiny pulse when switching from non-emission to the >>> emission states. But these big ones have such a huge wavefront that >>> in a >>> radio application once (2 years ago) I was unable to get the energy >>> squashed enough for the radio to work. Simply had to abandon the >>> design. >>> The radiation was detectable by simple sniffer well into the 900Mhz >>> band, highest freq my sniffer would capture. >> >> >> >> Is this due to the current spike or something else ? Why wouldn't a >> series inductor to control the >> risetime fix this? > > > I tried RF chokes of many values in series with the LED leads, tried > improving the ground plane, caps, caps in combination with RF chokes, > etc. > > Yes, it worked pretty well with a mu-metal shield surrounding the LED on > every side except where the light came out. But it was too costly to > manufacture. > > These noisy ones were made by HP. > > --Bob > > -- > > Replier: Most attachments rejected > -------------- > Bob Axtell > PIC Hardware & Firmware Dev > http://beam.to/baxtell > 1-520-219-2363 > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > email spamBeGonelistservspamBeGonemitvma.mit.edu with SET PICList DIGEST in the body > > > -- http://www.piclist.com hint: To leave the PICList TakeThisOuTpiclist-unsubscribe-requestEraseMEspam_OUTmitvma.mit.edu

> >>> I ran into a peculiar situation with these super high brightness > >>> devices: they radiate an inordinate amount of RF when switched. > >>> My approach was to PWM the LEDs to control brightness, but it failed. I would have thought you could PWM and then smooth so that the LED's only saw the resultant DC. The response curve would be very sensitive to variation as, rather than being well on and fully off as they would be with PWM, they would be being held partially on constantly. This approach MUST eliminate the PWM effects on the LEDs as they only see DC. Russell McMahon -- http://www.piclist.com hint: To leave the PICList RemoveMEpiclist-unsubscribe-requestTakeThisOuTmitvma.mit.edu

I helped design something that blows these away ;) Check out the following: http://www.enluxled.com I also designed a display booth for a show in vegas for these guys. They won 2 awards for their product, GE, Philips, Lumiled, Luxeon ... etc. all wanted info on this product. UL has been completed and they are ramping up for production. The Department of Energy also talked to us about some serious government contracts! 22W power consumption that gives you the same output as a 65W incandesent, awesome! Of course these are only for use in standard US light bulb sockets for now. Steve --- Russell McMahon <EraseMEapptechPARADISE.NET.NZ> wrote: {Quote hidden}> Luxeon LED illuminator site. > Very well done. > Copious technical information both on module > characteristics and design, > lifetime, operation ... > > http://www.lumileds.com/ > > For those who haven't met them, the Luxeon units > offer outputs comparable > with typical incandescent bulbs but with many > advantages (high lifetime, > good colour matching, high efficiency, bright well > controlled beam pattern, > ...). Applications include standard lighting > (torches, car lights, ...) and > specialist applications such as dental resin curing. > > Available in white plus arrange of colours and a > number of output patterns > and power levels. > > -- > http://www.piclist.com#nomail Going offline? Don't > AutoReply us! > email RemoveMElistservEraseMEEraseMEmitvma.mit.edu with SET PICList > DIGEST in the body > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

In a message dated 7/10/2004 11:11:08 PM Eastern Daylight Time, RemoveMEsteve_piclistspam_OUTKILLspamYAHOO.COM writes: I helped design something that blows these away ;) Check out the following: http://www.enluxled.com Do you know if they are planning to make a replacement for a regular incandescent light bulb that would be used in a ceiling light fixture or a table lamp? The savings would be enormous if you could use these in all existing incandescent applications in a house or office. I took a look at the web site and it seemed that, at this time, they are only doing the flood lights. I am assuming that the nature of LED units being pretty much directional is the reason for starting with a flood light application. Randy Abernathy 4626 Old Stilesboro Road NW Acworth, GA 30101-4066 Phone / Fax: 770-974-5295 Mobile: 678-772-4113 E-mail: RemoveMEcnc002TakeThisOuTspamaol.com I furnish technical support, repair, and other related services for your industrial woodworking machinery. My background as Senior Service Engineer for the SCMI Group for nearly fifteen years with factory training, combines with my extensive background in electronics, mechanics, pneumatics, electrical and CNC machinery to offer you needed support for your machinery. -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

Steve, do you know if they are manufacturing their own LEDs for this? Josh -- A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. -Douglas Adams On Sat, 10 Jul 2004 20:10:56 -0700, Steve Kosmerchock <EraseMEsteve_piclistspamspamBeGoneyahoo.com> wrote: {Quote hidden}> I helped design something that blows these away ;) > Check out the following: > > http://www.enluxled.com > > I also designed a display booth for a show in vegas > for these guys. They won 2 awards for their product, > GE, Philips, Lumiled, Luxeon ... etc. all wanted info > on this product. UL has been completed and they are > ramping up for production. The Department of Energy > also talked to us about some serious government > contracts! 22W power consumption that gives you the > same output as a 65W incandesent, awesome! Of course > these are only for use in standard US light bulb > sockets for now. -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

In a message dated 7/10/2004 11:41:15 PM Eastern Daylight Time, RemoveMEtechsavyKILLspamDSCHMIDT.COM writes: Great life, but compact fluorescents put out way more lumens per watt. How does the price compare to compact fluorescents? Dave Dave: You are correct, in fact they put out over twice the lumens (1100) at close to the same wattage (23). These figures are from the GE compact flourescent data page. The closest thing to the same specs to the LED is a 15 watt flood that puts out 550 lumens, obviously more efficient as well. Also, they are less than 1/4 the price at $18.00 per bulb. The 20 watt bulb at 1100 lumens is about half the price at $41.00 per bulb. The only thing I see that is an advantage is the estimated life of the LED lamps. The flourescent lamps have an estimated life of between 6,000 hours and 15,000 hours, the LED lamps an estimated life of 50,000 hours. You could purchase 4 of the flourscent bulbs for less than one of the LED lamps and that would be approximately 60,000 hours of use and a bigger savings in electricity cost than the LED. I know that in the future they will probably get the cost of the LED lamps down and their efficiency up but, for now I think the flourescents are the best value. Just my 2 cents worth. Randy Abernathy 4626 Old Stilesboro Road NW Acworth, GA 30101-4066 Phone / Fax: 770-974-5295 Cell: 678-772-4113 E-mail: Cnc002STOPspamspam_OUTaol.com I furnish technical support, repair, and other related services for your industrial woodworking machinery. My background as Senior Service Engineer for the SCMI Group for nearly fifteen years with factory training, combines with my extensive background in electronics, mechanics, pneumatics, electrical and CNC machinery to offer you needed support for your machinery. -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

The LEDs are bonded straight to the PCB by the LED manufacturer in Taiwan. I don't know all of the light comparison figures, but the guy from the DOE was "extremely" interested. He mentioned the government would like to push LED lighting. The fact that this light fits in a standard light bulb base makes it even better. I can't get into too many details (NDA), but I can say these things are awesome. Steve --- Josh Koffman <spamBeGonejoshybearSTOPspamEraseMEGMAIL.COM> wrote: {Quote hidden}> Steve, do you know if they are manufacturing their > own LEDs for this? > > Josh > -- > A common mistake that people make when trying to > design something > completely foolproof is to underestimate the > ingenuity of complete > fools. > -Douglas Adams > > On Sat, 10 Jul 2004 20:10:56 -0700, Steve > Kosmerchock > <KILLspamsteve_piclistspamBeGoneyahoo.com> wrote: > > I helped design something that blows these away ;) > > Check out the following: > > > > http://www.enluxled.com > > > > I also designed a display booth for a show in > vegas > > for these guys. They won 2 awards for their > product, > > GE, Philips, Lumiled, Luxeon ... etc. all wanted > info > > on this product. UL has been completed and they > are > > ramping up for production. The Department of > Energy > > also talked to us about some serious government > > contracts! 22W power consumption that gives you > the > > same output as a 65W incandesent, awesome! Of > course > > these are only for use in standard US light bulb > > sockets for now. > > -- > http://www.piclist.com hint: PICList Posts must > start with ONE topic: > [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other > [BUY]:,[AD]: ->Ads > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

one huge, huge advantage over fluorescent lights is that they actually produce white light with a reasonable color temperature. fluorescents that are even close in terms of color quality are much less efficient. truly white light makes a huge difference both psychologically and in being able to see colors correctly, whether trying to determine the color or read color codes at work or trying to eat meat that is supposed to be a color other than pale gray. there's also the elimination of mercury, some areas are now handling used fluorescent lamps as hazardous material and charging as much as $1 per tube for disposal- this is a big deal in the sign industry. as far as cost, you also have to factor in the cost of the ballast for fluorescents (admittedly not too bad). fluorescents also have a tendency to produce nasty RFI (even with newer ballast) and also tend to have a poor power factor and produce noise on the power lines as well which can be a problem if one is making sensitive measurements or using sensitive equipment. of course there's also the rather nasty behavior of fluorescents getting dimmer over time, often leading to them being used long after they should have been replaced and producing poor lighting while using the same amount of energy. i've seen a lot of this in stores where they are either too cheap or just don't realize the problem or it's affect on shoppers (it's a common practice to replace fluorescents every year to maintain reasonable output). the led lights also are not as fragile and avoid the cut hazard. i really love the led light idea, i hope the price drops soon (as it no doubt will as quantity increases like all electronics). it wouldn't surprise me if they were $20 or less in the near future, at that point i'll be buying a lot of them! Randy Abernathy wrote: {Quote hidden}> > In a message dated 7/10/2004 11:41:15 PM Eastern Daylight Time, > EraseMEtechsavyEraseMEDSCHMIDT.COM writes: > > Great life, but compact fluorescents put out way more lumens per watt. > How does the price compare to compact fluorescents? > Dave > > Dave: > > You are correct, in fact they put out over twice the lumens (1100) at close > to the same wattage (23). These figures are from the GE compact flourescent > data page. The closest thing to the same specs to the LED is a 15 watt flood ----------- -- <http://www.informationclearinghouse.info/article3267.htm> proof that the U.S. media is now state controlled! Ask your' local tv station why the hell they aren't airing the news any more! Our system of government requires an informed public, with their eyes open. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

Randy Abernathy <@spam@PICLIST@spam@spam_OUTmitvma.mit.edu> wrote: > I know that in the future they will probably get the cost of the > LED lamps down and their efficiency up but, for now I think the > flourescents are the best value. Unless you want red, green, or amber light... -Andy === Andrew Warren -- spamBeGoneaiwKILLspamcypress.com === Principal Design Engineer === Cypress Semiconductor Corporation === === Opinions expressed above do not === necessarily represent those of === Cypress Semiconductor Corporation -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email .....listservspam_OUTmitvma.mit.edu with SET PICList DIGEST in the body

or something that actually is white light, rather than a poor "cold" or "warm" but not hot approximation to true white light. i like a continuous spectrum, i like halogen, hopefully "white" leds will have more phosphors and more sum and difference colors and be closer to continuous eventually. until then, they are only useful for outdoor safety lighting and deliberately monochromatic lighting. no one should work or live under discontinuous, strobing light, i.e. flourescents. they stink, always have and always will, imho. Andrew Warren wrote: {Quote hidden}> > Randy Abernathy <TakeThisOuTPICLIST.....TakeThisOuTmitvma.mit.edu> wrote: > > > I know that in the future they will probably get the cost of the > > LED lamps down and their efficiency up but, for now I think the > > flourescents are the best value. > > Unless you want red, green, or amber light... > > -Andy > > === Andrew Warren -- TakeThisOuTaiwKILLspamspamcypress.com > === Principal Design Engineer > === Cypress Semiconductor Corporation > === > === Opinions expressed above do not > === necessarily represent those of > === Cypress Semiconductor Corporation > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > email .....listservRemoveMEmitvma.mit.edu with SET PICList DIGEST in the body -- <http://www.informationclearinghouse.info/article3267.htm> proof that the U.S. media is now state controlled! Ask your' local tv station why the hell they aren't airing the news any more! Our system of government requires an informed public, with their eyes open. -- http://www.piclist.com hint: To leave the PICList RemoveMEpiclist-unsubscribe-requestspamBeGonemitvma.mit.edu