The There Are No Stupid Questions Thread

If you can see the Internet.
the Internet can see you.

Someone is always willing to pay for every click and every mouse hover.
I wonder if someday some mogul will say:
You know, Iā€™m not sure paying to collect all this data is really doing us any good.
Lets drop the whole thing.

24Hrs later the WWW collapses.

All the Best,ā€™Jeff

Iā€™ve got an SP70 with the 70.2 LED. I really like it.
Itā€™s big and heavy and clunky.
If I was going on and extended S&R type of thing (which I never will I suspect).
Itā€™s the one I would grab.
PWM is so fast you will never see it. Like 19K if I remember.

Being able to turn the light off with the side switch is a big plus over, say, the L6.

The only thing I donā€™t like is the position of the front strap attachment.
Itā€™s right in front of the switch. The clip folds back and blocks the switch.
Also it makes the light front heavy. So carrying by the strap, slowly the light dips toward the ground.

Move the front connection point closer to the font fixes this.
Wish is was available in a warmer color. Warm works better for me outside.

All the Best,
Jeff

The first batches used a CW, maybe 6000-6500K, but now they offer it in 4700-5300K. Nice for new buyers, but those that already have it would have to swap it out.

Soā€¦ Internet = The Abyss.

Makes sense.

Mmm, I can deal with that.

Thanks for sharing your experience with the SP70, Jeff. I decided Iā€™m going to wait on getting one. The only use Iā€™d have of it is on a few occasions during the summer. My other lights handle everything else just fine during the rest of the year. It is good to see a solid neutral white emitter now provided. I may try to pick up one on discount at the end of the year.

Thanks. no Iā€™m not new to googleā€¦ I did try googling information but still couldnā€™t find anything that helped me understand the concept. I appreciate the information. Just figured I could get more direct info from the good people on blf.

Thank you!

Thanks.

I guess all the information we hear is not correct. I read on one of these threads that it was an Emisar.

The Jetbeam-II also has its driver glued but thereā€™s a very thin brass washer. If rubbed-off copper is actually the problem, Iā€™d see if I can find such a washer or a sheet of brass foil to make one.

There is a whole complicated situation when it comes to Chinese manufacturers of flashlights. This is why you see clones and more than one version of the same light. Hank has his company and he decided to use two brand names to distinguish two different lines of lights. Emisar and Noctigon. He did the Noctigon Meteor several years ago (2016 I think), but all his lights since then were the Emisar brand. So folks tend to associate all his lights as Emisar and he just recently decided to release the K1 under the Noctigon brand. People know itā€™s from the ā€œguy that does the Emisarsā€ and it has the same user interface as the Emisars so you can see how people might confuse it with an Emisar.

"... .... .... He did the Noctigon Meteor several years ago (2016 I think) ... ... ..."

Noctigon Meteor M43 was late Winter 2015, as far as I can narrow it down. My hopefully not so stupid question: Can I get mine modded (again) from XP-L to W2 emitters?

I am checking out Nichia 219B SW45K R9080. The setup is Noctigon 3UP MCPCB with Carclo 10507. My battery charger can be used as the power supply, so it is the source of the power. It does not have PWM. I am doing this just to see how it is before putting it into the light.

Is there like burn-in or break-in periods for the new LED?

On the first time ever power up, I saw huge amount of pink, as noted everywhere for this LED. I thought it could have been little bit too pink. However, I played with it for a while. It settled into very nice white with less pink.

I am thinking I just got used to the new tint because this is my first time seeing SW45K in person. But, my experiences with E21A 4500K with R9080 and 219B 4500K R9050 do not show something like of burn-in or break-in.

I only used 3.0A (1.0A each). All three of them appeared to show the same brightness. The MCPCB was mounted on the heatsink. I donā€™t think the LEDā€™s are burning up literally, not the tint turning into violet.

Have you experienced anything like this? I still think it is my imagination.

Color perception is very relative. The same LEDs will look completely different when the background light is noon sunlight vs incandescent lightbulbs for instance.

News Release 28-Jun-2020
Declining eyesight improved by looking at deep red light 650 to 1000nm

Peer-reviewed | experimental study | people

University College London

=

Does anyone have a source for a far red LED light? around 650 to 1000nm ; this research used 670nm

===

Samsung produces some 3535 deep red LEDs in 660nm and 730nm.

660nm
https://www.digikey.com/product-detail/en/samsung-semiconductor-inc/SPHRD2L3DH20E7W410/1510-SPHRD2L3DH20E7W410CT-ND/12083656

730nm
https://www.digikey.com/product-detail/en/samsung-semiconductor-inc/SPHRD1L3DH01A844B0/1510-SPHRD1L3DH01A844B0CT-ND/12083760

May be pretty difficult to drive the 730nm with a standard LED driver as the forward voltage is very low.

Hank, since there is a ā€œgrandma lightā€ being developed, maybe you could start an ā€œover the hill lightā€ for all the old and blind folks.

Helen Keller:
The only thing worse than being blind is having sight but no vision.

Hmmm, the necessary must be out there somewhere.
Good point about finding the appropriate driver ā€” thank you.

Hereā€™s a very pricey far red ā€œhealingā€ light

This source sells 660nm LEDs 1.06ā‚¬ 6% OFF|10 100 stĆ¼cke 1 watt 3 watt Warm/WeiƟ/blau/Royal Blau rot/grĆ¼n/ gelb/660nm UV Violet RGB High Power LED Chip Licht mit PCB oder nicht pcb|Leuchtperlen| - AliExpress*

Ah, hereā€™s one on a board:
3.07ā‚¬ 10% OFF|1w 3 w660nm Hochleistungs LED Chip Voll spektrum Wachstum Royal Deep Red 2,4 2,8 v 500 700ma DIY|Leuchtperlen| - AliExpress*

And a fully assembled flashlight:
Seaconch Red Therapy Light 9W Infrared Lamp Maximum Irradiance 660 Nm Led Pain 630nm 5 Minute Timer Red Light Therapy
US $62.90

Ah, Luxeonā€™s on it:

Now, to find a driver ā€¦.

hmmmm ā€”- red 670nm laser, pretty cheap
http://www.aixiz.com/store/product_info.php/products_id/312
670nm 5mW laser module 3VDC adj. lens 670 nm $6.50

Apparently has a driver. Or else is running on straight 3V, a couple of batteries?
Not tht Iā€™d want to point this straight into my eyeballs, of course. Maybe diffused or reflector-bounced off a white board ā€¦.

Thank you Scallywag, now i donā€™t feel so dumb anymore :+1: