Timeline for What form of electrical lighting has the smallest energy-footprint?
Current License: CC BY-SA 3.0
26 events
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| Nov 22, 2020 at 17:02 | answer | added | LazyReader | timeline score: -4 | |
| Apr 13, 2017 at 12:49 | history | edited | CommunityBot |
replaced http://sustainability.stackexchange.com/ with https://sustainability.stackexchange.com/
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| Apr 20, 2016 at 14:33 | review | Close votes | |||
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| Apr 17, 2016 at 8:36 | answer | added | John Spence | timeline score: 3 | |
| Mar 4, 2016 at 17:56 | answer | added | giardia | timeline score: 13 | |
| Nov 5, 2013 at 13:12 | comment | added | Flyto | Related question: skeptics.stackexchange.com/questions/18272/… | |
| Jul 7, 2013 at 18:18 | comment | added | Rody Oldenhuis | @theUg: well, I did say "money" (meaning any monetary involvement anywhere along the way) is not to be considered :) | |
| Jul 7, 2013 at 14:28 | comment | added | theUg | I would not go for “state of the art models of each kind”. This way you’d have to factor in marketing costs, and I doubt typical usage includes premium-priced products like this. Poor people cannot afford them, middle class is often thrifty, and opulently wealthy do not buy their own bulbs. :) | |
| May 12, 2013 at 1:58 | history | tweeted | twitter.com/#!/StackSustain/status/333400812074172419 | ||
| May 7, 2013 at 23:35 | answer | added | MeloMCR | timeline score: 1 | |
| May 7, 2013 at 15:24 | comment | added | Johnny | @Rody, Can you point me to some of these 100,000+ hour LED replacement bulbs? The ones I've seen from OSRAM/Sylvania, GE, Phillips, etc advertise 15K - 50K hours. I'm having trouble finding datasheets that give projected lifetimes for bright white LED's. Heat is the enemy of LEDs, so the brighter they are (thus the hotter they are in operation), the shorter the lifetime. | |
| May 7, 2013 at 13:04 | answer | added | THelper | timeline score: 18 | |
| May 7, 2013 at 9:29 | history | edited | Rody Oldenhuis | CC BY-SA 3.0 |
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| May 7, 2013 at 8:58 | history | edited | Rody Oldenhuis | CC BY-SA 3.0 |
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| May 7, 2013 at 8:49 | comment | added | Highly Irregular | Sounds like a great idea to me, @RodyOldenhuis! | |
| May 7, 2013 at 8:33 | comment | added | Rody Oldenhuis | @HighlyIrregular: Regarding the nature of the question; I don't really care (yet) about rep, I'm just curious :) In any case, I think you're right that I should probably split it up, at the very least to speed up getting answers. I propose leaving this question open but convert it to a community wiki, putting in links to all the subquestions related to it. In the end, when all the answers are in and the graph is generated, this question will then serve as a nice overview, and will be a nice showcase of the capabilities of this site. What do you say? :) | |
| May 7, 2013 at 8:28 | comment | added | Rody Oldenhuis | @HighlyIrregular: indeed; I would like to see some form of validation of such extrapolation methods. I realize it's virtually impossible given the extremely long lifetimes of LEDs to do the actual experiment, but I've never seen really good experiments showing that the extrapolations actually have some merit... | |
| May 7, 2013 at 8:25 | history | edited | Rody Oldenhuis | CC BY-SA 3.0 |
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| May 7, 2013 at 8:20 | comment | added | Highly Irregular | I remember reading about longevity testing of CDs, and the technique charted how the lifetime reduced as the storage temperature increased. A lower temperature lifetime estimate was then extrapolated from the results. | |
| May 7, 2013 at 8:18 | comment | added | Highly Irregular | This would be better broken into quite a number of separate questions that are reasonably answerable, such as "What is the energy it takes to create a single bulb". You'll probably get more upvotes doing it that way too! ;-) | |
| May 7, 2013 at 5:44 | history | edited | Rody Oldenhuis | CC BY-SA 3.0 |
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| May 7, 2013 at 5:41 | comment | added | Rody Oldenhuis | @Johnny: As far as the lifetimes; googling around a bit will show that most modern LED bulbs have lifetimes well in excess of 100.000 hours (in other words, 11.4 years of continuous operation). If you look up the numbers for individual LEDs, the numbers easily exceed 1 million hours. Granted, this is for low-power, unpackaged LEDs without any AC conversion circuitry involved, but I do expect the developments in the lighting industry to catch up with these numbers in the next 5 years. | |
| May 7, 2013 at 5:33 | comment | added | Rody Oldenhuis | @Johnny: Obviously, exact usage depends on latitude; these numbers are indeed just a random use case for my particular latitude. However, this is still how I want to set up my study, because the timings for the replacements will be different, it's easier to bring noise and outliers into the equation (we all forget to turn off the light once in a while), it's easier to model differences in wear due to the different load cycles, etc. But I guess it's mostly because I come from the simulation world, where theory and lab results never equal results found in practical applications :) | |
| May 6, 2013 at 23:36 | comment | added | Johnny | Why do you want real-world longevity tests (or at least statistical studies to back up longevity claims),for each light source but you (seemingly) pulled 5 hours/winter & 2 hours/summer usage out of thin air? Wouldn't it be better to use an average annual figure ? Most LED lightbulb replacements seem to have a published lifetime of around 25,000 - 50,000 hours, have you seen some that promise 2 million hour lifetime? | |
| May 6, 2013 at 22:27 | history | edited | Rody Oldenhuis | CC BY-SA 3.0 |
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| May 6, 2013 at 22:22 | history | asked | Rody Oldenhuis | CC BY-SA 3.0 |