Sofirn CO1R or similar "far red" light?

[angerdan]

There’s already a thread about the “vision improving in ageing eyes according to a new study by scientists at UCL” from 2020:

670nm deep red led helps eyesight

Interesting. Where can I source one of these?

Small torch costing £12 offers hope for over 40s with poor eyesight

And a thread on how to find a deep red (700-750nm) flashlight:

I want a 730nm far red light

I have a 660nm D4Sv2, and it is not red enough, practically yellow! So I want to know where I can acquire a red light that is so red that people will see it and think their life is a lie because the color that they thought was red all these years is actually just green that stretched itself out to look bigger like you are supposed to do when you see a bear to scare it away so it doesn’t gobble you up and make you bleed your orange blood even though it is actually red blood but people light it up…

Excellent manufacturer of custom LED flashlights is Hank Wang with its Store INTL Outdoor and the brands Noctigon/Emissar:

Emisar D4V2 High Power LED Flashlight - LED Flashlights

Emisar D4K 1*21700 High Power Quad EDC Led Flashlight - LED Flashlights

Here you can find flashlights with far-red option (deep red/photo red):
http://flashlights.parametrek.com/index.html?type=flashlight&led_color=photo%20red&price=40,90