Talk:SMD LED module

Txtigr (talk) 22:03, 12 March 2018 (UTC)== Efficiency == Can someone explain how efficiency can be over 100%? That defies the laws pf physics.

Deragon (talk) 11:34, 14 June 2015 (UTC)

It's not efficiency, it's lumens per watt. --192.55.54.40 (talk) 20:44, 7 July 2015 (UTC)


 * Nevertheless, efficiency can be over 100% although not on anything remotely close to being for sale. Some LEDs effectively lase using thermal energy, so that they output more light than the input electricity. Not breaking any laws of physics and the LED gets colder as it operates. Lithopsian (talk) 19:41, 30 March 2017 (UTC)

txtigr The above question arises from confusion between the word "Efficiency" and "Efficacy". The term used in the referred table is Efficacy as defined on the Wikipedia page https://en.wikipedia.org/wiki/Luminous_efficacy for Luminous Efficacy. Efficiency is generally dimensionless while Luminous Efficacy is dimensioned, with the common SI units being Lumens/Watt.

Dimensions
Under common dimensions, 2835(2.8mm x 2.5mm) should read 2.8mm x 3.5mm  — Preceding unsigned comment added by 50.102.65.248 (talk) 12:26, 21 January 2014 (UTC)


 * Thank you for . -- ToE 18:09, 23 April 2015 (UTC)

chips v.s. package --- SMD LED sizing
Chips refers to the InGaN crystal that is the blue light emmitter, the actual Light Emmitting Diode. Package refers to the LED, lead frame, encapsulating package, and conversion phosphor (making it white) SMD LED sizing refers to the packaging dimensions not the chip dimensions, which are much smaller.

24.182.238.142 (talk) 15:13, 10 August 2015 (UTC)Gavin@gptsllc.com

"3528 (aka 1210)"
Dear all, within the table is a single case named copy from user talk Lithopsian

SMD LED Module
Hi Lithopsian, so if it so "called", please correct the article Surface-mount_technology as well. It is the same table I'm using at work and see in multiple references (datasheets etc.). Some examples wanted? No problem:, , (ooops, unlicensed copy of WP?) and , I'm pretty sure, they are not all wrong... Please send me one or more references using this wrong notations, and I will bring you five others for each. Also the referenced table in Surface-mount_technology is different to this table. Why do you think it's not a simple error? As mentioned in the edit summary you can yourself easily verify that the 1210 is not identical to 3528. --Wassertraeger (talk) 09:05, 8 May 2017 (UTC)
 * I'm not disagreeing with your calculations, but that counts for nothing (see WP:SYNTHESIS). None of your links show that a 3528 SMD, and especially an LED, is referred to as a 1411, although in some contexts (eg. capacitors) it is. However 3528 SMD LEDs are frequently described and sold as 1210. Beats me why, might make an interesting paragraph if anyone knows. Maybe they're wrong but we aren't here to fix the world, only to document it. So you made a change, I reverted it. If you want to take it further, the place is Talk:SMD_LED_Module. The recommended procedure is WP:BRD, not WP:BRRR no matter how strongly you feel. FWIW, here are some LED-specific showing the industry-common usage:, , . I'd just as soon take it out completely. LED SMDs are almost always sold by their metric package sizes even in the US. The whole table is almost unreferenced and on the verge of being removed anyway, but that should all be discussed at the article talk page. Lithopsian (talk) 11:06, 8 May 2017 (UTC)
 * Please do not refer to unbranded LED from chinese webpages or hungarian internet shops. Let's remove this naming since there is no benefit for it. Concerning WP:BRRR: I have placed a reference, you reverted it without. Is it the way it works? Surely not. Did you use the discussion? So please let's simply remove this single designating which is also in your links not used as a solitude name, just in combination with the metric code. --Wassertraeger (talk) 09:45, 10 May 2017 (UTC)

end of copy
 * WP:BRRR is a joke. Don't follow it, you'll get blocked. Lithopsian (talk) 13:34, 17 May 2017 (UTC)

to keep it short: every one using a 1210 (3.05 mm x 2.54 mm) footprint from any CAD-library will have "a lot of fun" when trying to solder a 3528-LED, it's too small (3.5 mm x 2.8 mm).

There are obviously some chinese electronics dealer who uses this naming, but I couldn't find any good reference (manufacturers datasheets, CAD-libraries or electronic distributors) for this naming. Since Lithopsian didn't answer for more than a week I ask here for your opinion. If no one will deny the change it will be installed again next week. Feel free to search for it yourself: Digi-Key and Arrow Electronics sells both types of housings: "1411 (3528 Metric)" and "1210 (3125 Metric)", but not as the same device. --Wassertraeger (talk) 13:06, 17 May 2017 (UTC)


 * Thanks for the rant. Most of the table is now gone - it has sat for long enough full of uncited and somewhat dubious data.. Lithopsian (talk) 13:34, 17 May 2017 (UTC)

Package names & metric dimensions
This relates to the table in the "Common modules" section. Some of the package names are in imperial, whereas the corresponding dimensions are given in metric. One example is the 1206, an imperial size, which actually measures 3.2mm by 1.6mm, rather than 1.2 by 0.6 as written in the table. It looks like whoever wrote the table just assumed all the packages were metric without actually double checking. This is pretty misleading and I think should be cleaned up ASAP. - 電放三葉 (RadioTrefoil) 06:54, 24 July 2017 (UTC)

Edit - the aforementioned Surface-mount_technology table displays the correct information in this case - 電放三葉 (RadioTrefoil) 06:58, 24 July 2017 (UTC)

SMD LED Characteristics
Hello Lithopsian,

Thanks for your revision. Yesterday I was trying to add info about 5630 SMD LED chips. I think this page was benefiting a lot from displaying Luminance and Consumption info about each model. But I understand the reasoning behind this data might be flawed, and that's why you removed the info, is that so?

I'd like to launch for discussion a few questions that are motivated by the need to opt between different products using different LED Modules. What data can be used to compare between different SMD modules? Is Luminance and Consumption a characteristic we can attribute to each SMD type or do different brands produce them with different characteristics? Eventually would the best way of comparing specific LEDs to use consumption (in W) together with Effectivness (in %)? If so how could we calculate lumen output for a particular LED?

Hope we can have a productive discussion.


 * The additions to the table which I reverted were related to LED strip lights, not to the individual SMDs themselves. SMDs typically have forward operating voltages around 3V.  They can be wired in threes with a resistor on plastic strips to operate from 12V (or 6V or 24V), but they can equally be wired in hundreds to make a light bulb running at 120V or more. Although reliably-sourced information about the characteristics of different SMDs would be valuable, it could be difficult to find.  Little other than the size is standard, and much of the information on the web is simply marketing to make one particular product look good.  The old 3528 and 5050 SMDs have fairly standard features, but almost everything since them comes in a wide range of powers and light outputs.  Picking one value to go in a table would be difficult, picking a range might be hard to verify.  Even an individual SMD can be operated at different voltages with very different results.  Lithopsian (talk) 18:15, 6 October 2017 (UTC)

Merge this into Surface-mount_technology?
Other electronics components such as resistors, capacitors and even ICs and transistors are in Surface-mount_technology, what makes SMD LED have its own wiki page? As far as I can see this page only contains sizes for SMD LED Fëanor Engineering (talk) 05:59, 18 October 2017 (UTC)
 * There used to be a lot more information, but it wasn't sourced and it was a magnet for all sorts of wild claims and spam. I wouldn't object to a merge, although I suspect some others would.  Lithopsian (talk) 10:57, 18 October 2017 (UTC)