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#1
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bpnjensen wrote:
On May 20, 3:14 pm, "Brenda Ann" wrote: "Joe Analssandrini" wrote in message oups.com... Have you tried any of the LED flashlights? I bought several from AES. They sell a model for $9.99 that is machined from aluminum and runs on 3 AAA batteries: "HOUSE OF DEALS 9LED/3AAAFLSLT*" see this listed at: http://search.cartserver.com/search/...&cartid=a-6994... It's the third item down. I have to tell you this thing is BRIGHT! AND it's made as well as any MagLight I own. These will give you something of an idea as to what can be done with LEDs. If this can be accomplished with flashlights, I can't wait until they achieve this level of lighting quality with home LED light bulbs. (I've even seen some LED flashlights in the "Dollar Tree" store. They have only 3 LEDs and are not as bright or as well made as the AES models, but for only a dollar ... ) I used to think the multi-LED flashlights were bright (and, indeed, compared to a small incandescent flashlight, they are... but much more difuse). The ones that are REALLY bright are the Luxeon® type LED lights. These are the ones most likely to eventually make it into meaningful home lighting. I have some 32 LED lamps that I use in various places. They are about the same brightness level as the little 7 1/2 watt sign bulbs (but of course use less than one watt). The Luxeon is many times brighter, and with just a single light source. These are quite a bit more expensive for the higher power ones, but the 1 watt and 3 watt versions are coming down in price rapidly. Not mine:http://cgi.ebay.com/5-WATT-LUXEON-LE..._W0QQitemZ...- Hide quoted text - - Show quoted text - I agree with Joe and Brenda about LEDs, and I cannot believe that the powers that be have not jumped onto the bandwagon with these things. Their potential is enormous. They are fairly cheap, last nearly forever (maybe that's why?) and use a shred of the energy used by any other viable light source. Bruce Jensen Actually, they are, in a way, getting in on the LED wagon. Here in The Windy, as well as in a good number of venues I've visited in Wisconsin, the traffic lights have been changed from incandescent, to LED arrays. They're very harsh to look at without the original color filters used with the incandescents because the colors are pure, and the viewing angle is narrow...putting the output of nearly 100 high output LED's into a narrow beam. Small matter. Slap the filter over the LED's and you've got a mellower color output with no diminution in brightness. ] They'll last. Lower maintenance costs. Total energy for the traffic system is reduced, but not by as much as you might think. But they depending on installation and operating parameters, produce a hellaceous amount of RF noise. The LED arrays in my area cast RFI shadows as far inland as my house. It can be overcome. Whether it will is a matter of some debate. LED's are particularly well suited for this application because the color purity is high, and consistent. Most applications for white LED's have limited applicable product due to the generally more blue nature of white LED light. LED's are also finding their way into the marker, tail and brake lights of many models of car. With varying results depending on the purity of the voltage applied. Also easily overcome. And manufacturers are motivated. All of the flashlights in my house, my flight bag, tool and remote kits, and vehicle glove boxes are multi LED models. Varying color temperature makes some better than others. There are some track lighting systems that are retrofittable to LED projectors. For more than $40 a pop. With dramatic long term savings. Casual lighting, like table lamps are still not practical for LED lighting, and the color temperatures of many white LED's are still too blue to be practical for most applications. But there is a lot of development going on. With progress in color and lumen output being made at a good rate. Nearly every wholesaler of light bulbs for general lighting, now, offers some LED product for home and business lighting applications. |
#2
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I own three hand held LED lights.
cuhulin |
#3
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On May 21, 2:29 pm, D Peter Maus wrote:
bpnjensen wrote: I agree with Joe and Brenda about LEDs, and I cannot believe that the powers that be have not jumped onto the bandwagon with these things. Their potential is enormous. They are fairly cheap, last nearly forever (maybe that's why?) and use a shred of the energy used by any other viable light source. Bruce Jensen Actually, they are, in a way, getting in on the LED wagon. Here in The Windy, as well as in a good number of venues I've visited in Wisconsin, the traffic lights have been changed from incandescent, to LED arrays. They're very harsh to look at without the original color filters used with the incandescents because the colors are pure, and the viewing angle is narrow...putting the output of nearly 100 high output LED's into a narrow beam. Small matter. Slap the filter over the LED's and you've got a mellower color output with no diminution in brightness. ] Good to hear. They'll last. Lower maintenance costs. Total energy for the traffic system is reduced, but not by as much as you might think. How so? But they depending on installation and operating parameters, produce a hellaceous amount of RF noise. The LED arrays in my area cast RFI shadows as far inland as my house. That stinks - would this be true of ousehold LEDs too? Probably... It can be overcome. Whether it will is a matter of some debate. LED's are particularly well suited for this application because the color purity is high, and consistent. Most applications for white LED's have limited applicable product due to the generally more blue nature of white LED light. LED's are also finding their way into the marker, tail and brake lights of many models of car. With varying results depending on the purity of the voltage applied. Also easily overcome. And manufacturers are motivated. I almost think my headlights are LEDs - they are very blue, and won't run down the battery. All of the flashlights in my house, my flight bag, tool and remote kits, and vehicle glove boxes are multi LED models. Varying color temperature makes some better than others. The red ones are killer for astronomy at night, and can be varied in brightness to suit. There are some track lighting systems that are retrofittable to LED projectors. For more than $40 a pop. With dramatic long term savings. Casual lighting, like table lamps are still not practical for LED lighting, and the color temperatures of many white LED's are still too blue to be practical for most applications. Could filters solve this problem? But there is a lot of development going on. With progress in color and lumen output being made at a good rate. Nearly every wholesaler of light bulbs for general lighting, now, offers some LED product for home and business lighting applications. Excellent news - thanks. BJ |
#4
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bpnjensen wrote:
On May 21, 2:29 pm, D Peter Maus wrote: bpnjensen wrote: I agree with Joe and Brenda about LEDs, and I cannot believe that the powers that be have not jumped onto the bandwagon with these things. Their potential is enormous. They are fairly cheap, last nearly forever (maybe that's why?) and use a shred of the energy used by any other viable light source. Bruce Jensen Actually, they are, in a way, getting in on the LED wagon. Here in The Windy, as well as in a good number of venues I've visited in Wisconsin, the traffic lights have been changed from incandescent, to LED arrays. They're very harsh to look at without the original color filters used with the incandescents because the colors are pure, and the viewing angle is narrow...putting the output of nearly 100 high output LED's into a narrow beam. Small matter. Slap the filter over the LED's and you've got a mellower color output with no diminution in brightness. ] Good to hear. They'll last. Lower maintenance costs. Total energy for the traffic system is reduced, but not by as much as you might think. How so? You've got 100 elements putting out as much light as a single incandescent. One two, or ten superbright LED's will save you a lot of energy. 100...not so much. But still, there's less heating, there IS an energy saving, and there's far less maintenance involved. That, alone, is worth the investment. Hell, it's the reason I've pulled all the incandescents out of my stereo hardware and dropped in LED's. Someunits, like my Mac C-26 look different, because of the face was created for incandescent light, with it's higher red output, to provide both the green filters and the red with output using the same bulbs...but it's a small difference. Units using incandescents for the warmth of the parchment look on meters don't do as well with LED's, but as manufacturers warm up the output on their devices, that will change. Most units, however, like my McKay Dymek AM-5 with, what 8 lamps...when converted to LED's (and drop-in replacements, at that) Look pretty nice. No more burning of plastic diffusers. No more opening the damned things up ever few months to replace incandescents. But they depending on installation and operating parameters, produce a hellaceous amount of RF noise. The LED arrays in my area cast RFI shadows as far inland as my house. That stinks - would this be true of ousehold LEDs too? Probably... Depends on the power source. I've noticed it more on AC/DC LED drop-ins than DC LED's alone. But even that can be abated with a bit of capacitance across the junction, and across the diodes of the power source. It can be overcome. Whether it will is a matter of some debate. LED's are particularly well suited for this application because the color purity is high, and consistent. Most applications for white LED's have limited applicable product due to the generally more blue nature of white LED light. LED's are also finding their way into the marker, tail and brake lights of many models of car. With varying results depending on the purity of the voltage applied. Also easily overcome. And manufacturers are motivated. I almost think my headlights are LEDs - they are very blue, and won't run down the battery. Not likely. At least not at this stage. There simply isn't enough lumen output in LED technology, yet. Likely, they're discharge lamps. Higher efficiency, and bluer than incandescents. All of the flashlights in my house, my flight bag, tool and remote kits, and vehicle glove boxes are multi LED models. Varying color temperature makes some better than others. The red ones are killer for astronomy at night, and can be varied in brightness to suit. And they're finding their way into maplights on aircraft for that reason. There are some track lighting systems that are retrofittable to LED projectors. For more than $40 a pop. With dramatic long term savings. Casual lighting, like table lamps are still not practical for LED lighting, and the color temperatures of many white LED's are still too blue to be practical for most applications. Could filters solve this problem? Not without considerable loss in output. A filter can only subtract from the input. Low red output is problem. A filter can only decrease the higher frequencies to bring the red back into balance. With as little red as there is in the output of a white LED, a you'd be defeating your own purpose by attempting to correct color balance with filtration. But, again, manufacturers are working on this. The last shipment of LED flashlights I got were a lot warmer than the previous, so it's not like it can't happen, in time. This is still new technology for general application. A little patience, and there will be some serious improvements in the pipeline. Nearly every wholesaler of light bulbs for general lighting, now, offers some LED product for home and business lighting applications. Excellent news - thanks. I check about once a month for new purveyors of LED drop-ins. More every time. SuperbrightLEDs.com is a good source for some types. Digi-key is carrying more LED products for general use. Do a general websearch. Be amazed. It IS, indeed, excellent news. |
#5
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![]() "D Peter Maus" wrote in message ... You've got 100 elements putting out as much light as a single incandescent. One two, or ten superbright LED's will save you a lot of energy. 100...not so much. But still, there's less heating, there IS an energy saving, and there's far less maintenance involved. That, alone, is worth the investment. 32 ultra bright LED lamps in a single bulb draw about a watt, perhaps 1 1/4 watts. I suspect the traffic lights may draw as much as 5 watts with the number of lamps therein. These are replacing standard 67 1/2 watt incandescents normally used in traffic lights. |
#6
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Brenda Ann wrote:
"D Peter Maus" wrote in message ... You've got 100 elements putting out as much light as a single incandescent. One two, or ten superbright LED's will save you a lot of energy. 100...not so much. But still, there's less heating, there IS an energy saving, and there's far less maintenance involved. That, alone, is worth the investment. 32 ultra bright LED lamps in a single bulb draw about a watt, perhaps 1 1/4 watts. I suspect the traffic lights may draw as much as 5 watts with the number of lamps therein. These are replacing standard 67 1/2 watt incandescents normally used in traffic lights. Figures I've seen for the arrays put them at just under 40 watts in service. That would be the extreme LED's built for commercial purposes. About 100 of them in the array. As a point source, each one will knock you back a step. In an array within 6 feet they'll leave you glare blind. |
#7
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D Peter Maus wrote:
Actually, they are, in a way, getting in on the LED wagon. Here in The Windy, as well as in a good number of venues I've visited in Wisconsin, the traffic lights have been changed from incandescent, to LED arrays. They're very harsh to look at without the original color filters used with the incandescents because the colors are pure, and the viewing angle is narrow...putting the output of nearly 100 high output LED's into a narrow beam. Small matter. Slap the filter over the LED's and you've got a mellower color output with no diminution in brightness. ] They'll last. Lower maintenance costs. Total energy for the traffic system is reduced, but not by as much as you might think. But they depending on installation and operating parameters, produce a hellaceous amount of RF noise. The LED arrays in my area cast RFI shadows as far inland as my house. It can be overcome. Whether it will is a matter of some debate. LED's are particularly well suited for this application because the color purity is high, and consistent. Most applications for white LED's have limited applicable product due to the generally more blue nature of white LED light. LED's are also finding their way into the marker, tail and brake lights of many models of car. With varying results depending on the purity of the voltage applied. Also easily overcome. And manufacturers are motivated. All of the flashlights in my house, my flight bag, tool and remote kits, and vehicle glove boxes are multi LED models. Varying color temperature makes some better than others. There are some track lighting systems that are retrofittable to LED projectors. For more than $40 a pop. With dramatic long term savings. Casual lighting, like table lamps are still not practical for LED lighting, and the color temperatures of many white LED's are still too blue to be practical for most applications. But there is a lot of development going on. With progress in color and lumen output being made at a good rate. Nearly every wholesaler of light bulbs for general lighting, now, offers some LED product for home and business lighting applications. I'm thinking electroluminescent lights may end up taking over for home lighting, though it'll look different from what we're used to. http://www.electronicproducts.com/Sh...5.jul2007.html But for now, it's still a little expensive. A problem with LEDs is they project light on a relatively narrow beam. A normal light bulb is omni-directional. One way of dealing with the color balance of LEDs is you can mix in some red ones with the white ones, but again, the narrow beam from an LED makes it tougher to get even light with even color balance. I've done some LED lighting at my observatory, and at home. At the observatory, we put a recessed red LED every 4" in the molding for the dome trim ring so they tend to light the walls and floor. We also made an LED lectern light for star charts. At home, I've got white ones that illuminate a stairwell, and I've got some mounted on the top of a beam that are aimed at the cathedral ceiling in my kitchen for background lighting. I use regulated DC power supplies so they can dim quietly, though with my antenna a couple hundred feet away, I doubt it would matter. |
#8
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There are a lot of them new fangled LED traffic lights around here
too.How do I tell which traffic lights have them spy cameras up there? cuhulin |
#9
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I think some of those LED traffic lights have fresnell (spelling) lenses
on them. cuhulin |
#10
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On May 22, 8:42 am, wrote:
I think some of those LED traffic lights have fresnell (spelling) lenses on them. cuhulin Cuhulin, A Fresnel Lens is really not needed http://en.wikipedia.org/wiki/Fresnel_lens with a well designed "Array" of LED Lights http://en.wikipedia.org/wiki/Led The individual LED Lights can be positioned and configured to produce the same effect with out the expense of a Fresnel Lens. Flat - Concave - Convex Center-Weighted -or- Edge-Enhanced LEDs -another- Super Bright Idea ! http://www.superbrightleds.com/ i have seen the light of the future -and- it is an led ! - luxeon be it's name . . . ~ RHF http://www.luxeonstar.com/ |
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