4x E21A 9080 CRI output test by Texas_Ace - Amazing tint and good output

Texas_Ace · 2020-01-23T17:59:05.000Z

True, there might be some LED’s coming out that could use testing. I have not had time to keep up with the latest LED’s. Last “mainstream interesting” LED’s I saw were the Boost HX and SBT90.2.

I can obviously still take measurements, just not sure how to handle the new calibration without making things really confusing.

djozz · 2020-01-23T19:16:36.000Z

I understand. I keep my old calibration while knowing it is high, because it keeps my tests comparable over the years. Because it is not too much different from reality (luckily just 7-11% high), sticking to the djozz-lumen does not give a grossly wrong idea of the led performance.

Texas_Ace · 2020-01-23T19:20:07.000Z

djozz:

I understand. I keep my old calibration while knowing it is high, because it keeps my tests comparable over the years. Because it is not too much different from reality (luckily just 7-11% high), sticking to the djozz-lumen does not give a grossly wrong idea of the led performance.

Yeah, if mine was only 10% high then I would dot he same but at closer to 30% that is just too much of a difference to keep the same calibration for me.

I considered changing all my old readings by 30% and updating the old threads but that is a LOT of work and still not totally comparable.

djozz · 2020-01-23T19:22:10.000Z

Hey Agro, you like numbers, how about McGivering some stuff together and start doing emitter tests?? Me I am certainly not motivated enough to test every new emitter that comes out, and it sounds like TA feels about the same about it. And koef3 posted some tests for a couple of months but stopped after that. I think BLF is big enough for an extra led tester.

Texas_Ace · 2020-01-23T19:26:14.000Z

Tiss an option, it is really not that hard, just time consuming. A bench power supply, lumen tube / sphere, PC heatsink (stock CPU heatsinks work fine for most things) with some holes drilled and tapped to fix the MCPCB and an excell spreadsheet is basically all you need to take the measurements.

Then just some testing to figure out the best testing methods, figuring out the voltage drop in the wires etc.

Agro · 2020-01-23T19:33:15.000Z

djozz:

Hey Agro, you like numbers, how about McGivering some stuff together and start doing emitter tests?? Me I am certainly not motivated enough to test every new emitter that comes out, and it sounds like TA feels about the same about it. And koef3 posted some tests for a couple of months but stopped after that. I think BLF is big enough for an extra led tester. :innocent:

I’ve been thinking about it. But I really lack all the essential items except for wires and DMM. No sphere, no PSU, no cooling setup.
I intend to buy the first and the second eventually but not this year. This year my focus is to upgrade my main EDC light and it will cost me a lot.

djozz · 2020-01-23T19:53:58.000Z

Fair enough, but I could always try to convince you!

Agro · 2020-01-23T22:12:36.000Z

Close to 30% is a big error
I do believe that all these tests deserve a warning label telling the readers to apply a certain correction factor, like djozz tests do.
You could add a joke that everything is bigger in Texas.

I wouldn’t suggest calling these Texas Lumens and using them in future tests though, the name “lumen” would be confusing. You could call them something rlse, f.e. likeable measurements and keep them.
Or I would suggest abandoning them. That’s what I would do, serms that in a long term it would be more usrful.

Texas_Ace · 2020-01-24T13:33:40.000Z

Yeah, that is basically what I have one at this point, If I do any more tests they would be with the new calibration.

I was not aware of the issues with the accuracy until long after most of these tests were posted. Only found out about it due to the muakka calibration lights.

iamlucky13 · 2020-01-24T07:33:21.000Z

djozz:

I understand. I keep my old calibration while knowing it is high, because it keeps my tests comparable over the years. Because it is not too much different from reality (luckily just 7-11% high), sticking to the djozz-lumen does not give a grossly wrong idea of the led performance.

I appreciate both that you report with the same calibration, and share what you know about its accuracy. It makes the data very useful.

Aussiemandias · 2021-03-18T08:42:06.000Z

Hi folks,

Just wondering if a quad E21A (in series) on a 16mm board could be run in a convoy s2+? I’m not after high output. In fact the dimmer the better. I don’t know the maths though.

Pavlo · 2021-03-18T09:28:28.000Z

Aussiemandias:

Hi folks,

Just wondering if a quad E21A (in series) on a 16mm board could be run in a convoy s2+? I’m not after high output. In fact the dimmer the better. I don’t know the maths though.

If in series, you would need a 12v boost driver. I’m pretty sure majority of S2+ come with a 3V driver. In short, it’s possible with the correct driver

Aussiemandias · 2021-03-18T09:29:40.000Z

Pavlo:

Aussiemandias:

Hi folks,

Just wondering if a quad E21A (in series) on a 16mm board could be run in a convoy s2+? I’m not after high output. In fact the dimmer the better. I don’t know the maths though.

If in series, you would need a 12v boost driver. I’m pretty sure majority of S2+ come with a 3V driver. In short, it’s possible with the correct driver

Ok, thanks. :+1:

Aussiemandias · 2021-03-18T10:15:51.000Z

Alternative question then, what about a quad in parallel? Would that run off a 7135*x driver?

Thanks in advance for any help. Obviously I’m very new to this, but an incorrigible fiddler.

thefreeman · 2021-03-18T11:35:50.000Z

Yes that will work

Aussiemandias · 2021-03-18T12:02:09.000Z

thefreeman:

Yes that will work

Awesome. I’ll give it a crack then. Thanks!

polo8 · 2022-02-02T00:16:02.000Z

I am reading this wrong or is the single more efficient than the quad?

thefreeman · 2022-02-02T00:30:32.000Z

Probably low CRI given the large difference at the same current per LED.

Texas_Ace · 2022-02-03T14:58:03.000Z

polo8:

I am reading this wrong or is the single more efficient than the quad?

It is possible in this case since these LED’s do not have DTP they are effected by temperature a lot more then most LED’s we use. Thus the extra heat from the nearby LED’s could cause they to drop efficiency some. Although in the real world I doubt this would be noticeable.

thefreeman · 2022-02-03T15:31:30.000Z

At lowish current we shouldn’t see such large difference: 199 vs 145lm/W at 250mA per LEDs, plus they were tested on Clemence’s boards right ?