[BLF special edition light] new Sofirn AAA twisty high CRI Yuji 5mm LED (CCT 3200K or 5600K) for 6.50 USD

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mortuus
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I cant make that video to work ?

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joechina
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Isn’t it basement, 1th floor, 2th floor?

But definitely a drop test! Smile

Sofirn
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joechina wrote:
Isn’t it basement, 1th floor, 2th floor?

But definitely a drop test! Smile

No basement actually even though it looks like.

Hope we can move to a better building next year…

djozz
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Here is two more, something with ice and something with water. Must be fun doing these tests, also for them Smile

mortuus
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That looks fun, i would like a job like that.

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TM Miller
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I would like one in 3200k.
If they will feel as great as they look, I’ll want more Smile

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djozz, thanks for sharing the videos! And Sofirn, thanks for doing this!
This will surely be a great light Wink I’m liking this Big Smile

mortuus wrote:
That looks fun, i would like a job like that.

Amen to this!!! Beer Evil

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strongest2004
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Hi.
I am in for 2×3200K.

Thanks

Low mode and long runtime lover…

oto
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I want one 3200K

richnpc
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Sofirn, great job on the tests and videos.

dealgrabber2002
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Drop and dunk test is good enough for me. I have never had a car ran over any of my lights.

Satan@103TFS
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Any beam shot compare between 3200K vs 5600K version ?

teacher
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That Drop Test was especially impressive!! The other two were good also.

Thanks Sofirn & thanks for sharing djozz. Thumbs Up

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Duramarks
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Im interested in one or more.

goshdogit
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Excellent!

Thank you for sharing the videos, Sofirn! Thumbs Up

patmurris
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djozz wrote:
Barry told me that the beamshots of post #972 above were taken with the light at about 30cm from the wall, “tried 1m but the beam is too big and not bright and clear”.

Beam too big and dim at 1m?
That does not sound very good to me… It makes me think of those cheap 20c button cell keychain lights.

djozz
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patmurris wrote:
djozz wrote:
Barry told me that the beamshots of post #972 above were taken with the light at about 30cm from the wall, “tried 1m but the beam is too big and not bright and clear”.

Beam too big and dim at 1m?
That does not sound very good to me… It makes me think of those cheap 20c button cell keychain lights.


Not surprising,

Both are basically a battery plus a 5mm led (the reflector adds just a little to the beam, most light exits the light directly). The best version button cell light, the Photon freedom micron, puts out about 5 lumen, while our Sofirn light will put out about 8 lumen. Not that much difference.

The difference is not in the beam but in the runtime, the durability, the universal availability of AAA batteries and that those button cell lights are ugly.

iamlucky13
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I can’t watch the videos due to a web filter at work, but I’m eager to get home and watch them!

patmurris wrote:
djozz wrote:
Barry told me that the beamshots of post #972 above were taken with the light at about 30cm from the wall, “tried 1m but the beam is too big and not bright and clear”.

Beam too big and dim at 1m?
That does not sound very good to me… It makes me think of those cheap 20c button cell keychain lights.

It’s hard to interpret what he meant, not knowing the camera settings.

For a rough idea what to expect, put a layer or two of matte finish tape (eg- Scott Magic) on a ~10 lumen light.

This will not be a throwy light, nor high output. but it should be fine for finding your way around the house, checking your glovebox, helping use your keys, reading, and many other uses.

neo71665
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dealgrabber2002 wrote:
Drop and dunk test is good enough for me. I have never had a car ran over any of my lights.

Ran over by a car, fell off the core support and slung across the shop, fell out of my pocket doing 60 on a motorcycle. Yeah my old light was beat to snot and well used. Reason why my my brand and even model of go to light hasn’t changed.

Yeah the motorcycle made my stomach turn. Was surprised it only slide over to the ditch without doing anybody any damage. Bigger surprise we even found it. You see me you might laugh but it’s the reason why I have everything tethered and clipped down.

patmurris
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djozz wrote:
patmurris wrote:
djozz wrote:
Barry told me that the beamshots of post #972 above were taken with the light at about 30cm from the wall, “tried 1m but the beam is too big and not bright and clear”.

Beam too big and dim at 1m?
That does not sound very good to me… It makes me think of those cheap 20c button cell keychain lights.


Not surprising,

Both are basically a battery plus a 5mm led (the reflector adds just a little to the beam, most light exits the light directly). The best version button cell light, the Photon freedom micron, puts out about 5 lumen, while our Sofirn light will put out about 8 lumen. Not that much difference.

The difference is not in the beam but in the runtime, the durability, the universal availability of AAA batteries and that those button cell lights are ugly.

Thanks for the clarification. Now the diagram i’ve seen somewhere makes more sense. I haven’t followed this project close enough i guess.

Sorry if this has been discussed before, but aren’t there more modern and efficient alternatives to those ‘old school’ leds – COB for instance?

Phlogiston
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patmurris wrote:
Sorry if this has been discussed before, but aren’t there more modern and efficient alternatives to those ‘old school’ leds – COB for instance?

Actually, there’s not much in it. The Yuji LED puts out about 6lm at 20mA and about 3V. That’s about 100lm/W, so efficiency is OK.

Output is low compared to a similarly-sized COB, but this is meant to be a last-resort light, so there’s a tradeoff: lower output for more runtime.

The 5mm LED also has the significant advantage of being completely encapsulated in all directions, which helps with robustness – another desirable characteristic of a last-resort light. The shape of the package even gives it a built-in lens.

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Interested in one or more

iamlucky13
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Many thanks to Sofirn for sharing that testing! I shall inform gurdygurds that this light appears to be prepared for his gauntlet.

mortuus wrote:
I cant make that video to work ?

I had to disable my ad blocker to get the videos to play.

iamlucky13
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Phlogiston wrote:
patmurris wrote:
Sorry if this has been discussed before, but aren’t there more modern and efficient alternatives to those ‘old school’ leds – COB for instance?

Actually, there’s not much in it. The Yuji LED puts out about 6lm at 20mA and about 3V. That’s about 100lm/W, so efficiency is OK.

Output is low compared to a similarly-sized COB, but this is meant to be a last-resort light, so there’s a tradeoff: lower output for more runtime.

The 5mm LED also has the significant advantage of being completely encapsulated in all directions, which helps with robustness – another desirable characteristic of a last-resort light. The shape of the package even gives it a built-in lens.

That’s close to the worst case specified performance. Best case is 2.7V and 8 lm at 20mA, which would be 148 lm/W.

Considering this is a 95+ CRI emitter, anywhere in that range is pretty decent, and the high end is good enough to be hard for me to believe. When djozz tested an 80+ CRI Nichia 219C, his numbers at the closest datapoint to the rated current worked out to 139 lm/W.

patmurris
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Thanks for the details about the led being used.

Why not have three of them and get read of the useless reflector to triple the output?
That would not add much complexity and should not impede robustness either?

Sorry about the argument but i’m having a hard time wrapping my mind around a new 2018 light putting out only 8 lumen…

djozz
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patmurris wrote:
Thanks for the details about the led being used.

Why not have three of them and get read of the useless reflector to triple the output?
That would not add much complexity and should not impede robustness either?

Sorry about the argument but i’m having a hard time wrapping my mind around a new 2018 light putting out only 8 lumen…


It is much more about runtime as it is about output, it is build as a last resort light, 8 lumen compared to no light at all is huge, also in 2018.
But what that 95CRI does in a last resort light is highly questionable of course Big Smile
djozz
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I think the last of the video’s, they did it rather carefully instead of full speed, but they did succesfully run it over by a truck Smile

TM Miller
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patmurris wrote:
Thanks for the details about the led being used.

Why not have three of them and get read of the useless reflector to triple the output?
That would not add much complexity and should not impede robustness either?

Sorry about the argument but i’m having a hard time wrapping my mind around a new 2018 light putting out only 8 lumen…

What does ANY kid do, when you give him a flashlight, no matter – as a gift, or to use for a short while? Crazy
Literally, every child turns it on and looks into the bulb/led, whatever the ligh source. When the kid has made sure there are no monsters under the bed and in the dark bathroom, he or she drops the flashlight on concrete floor, in water, disassembles it, changes polarity of the battery, whatever. Afterwards, if the flashlight has survived, he / she leaves it on…
Don’t you still see a use for a 8 lumen, crash, water and freeze safe flashlight in 2018? The only issue left in this is disassembling…

djozz
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Barry mailed me some other test results, mail=below. He is concerned that we think the output is too little. But we decided on 25mA because of durability and of runtime, so the output is what it is when you use these Yuji leds. They may come with a cool white low CRI version at some point, that would have an output over 10 lumen.

Barry wrote:
Hi Jos,

lab tests results are available.
1. function test; 2. waterproof test; 3. walkie talkie and static electricity interference; 4. 65℃ storage for 24 hours; 5. -35℃ storage for 24 hours; 6. 70℃ for 30 mins then convert to -35℃ for 30 mins; 7. warm white average 5.5LM, neutral white 7.5LM; 8. warm white: avarage 1.5LUX, 6 cd, 4.9m distance, neutral white: 2.4 LUX, 9.5 cd, 6.1m distance. 9. salt fog test; 10. 6 times drop tests from 1.2m; 11. shaking test.

samples passed all the tests. But I don’t know if the lumen is satisfied (current is 25mA). What do you say?

matik42
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Sorry, maybe this posted allready.

How hot they get after 10-20 min continous work

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