WTB Deep Red LED Flashlight or build one for me

Yes:

https://www.google.com/search?q=human+vision+sensitivity+spectrum&source=lnms&tbm=isch&sa=X

Most of the Google images show vision stopping before or at 700. Very few show any light above 700. So the answer seems to be no. But they don’t say IR in the description, so I assume people can see at least half of the light. Anyone with experience?

Beyond my pay grade

I missed this one that was for sale, so I had Brad (18sixfifty) build a more powerful one for my brother, I think it was around 5amps? For Sale. UF-T20 with Phlatlight PT-54 (Red High power emitter) $55 (sold)

100 yards is easily done with the bigger lights like the larger of the Brinyte lights like the S18 and S28, the B158 will do it easily on full focus.

The Solarforce M3 also works fairly well with a red XP-E and the green version throws really well - I have and M3 for which I’ve built switcheroo pills. :slight_smile:

http://www.customlites.com/Solarforce-M3-with-Red-or-Green-XPE2-SOL-M3-COLOR.htm

Rabbit eyes pop much better with red light than white or green. Fox eyes light up well with red light also. Green makes fox eyes light right up really bright, and green is more visible to us, and the green XP-E’s commonly used in these lights will out throw the red ones by a good way.

I ordered a T20 host, red xp-e2, and a qlite driver that’ll be maxed out at 1.9a…we’ll see how that build goes.

I’d be interested in a triple star with red emitters. Can’t find any right now though.

There are several sources for triple stars with red emitters around.
I recall this one: SinkPAD 20mm Tri-Star LEDs

Oh, and “it’s a poor memory that only works backwards” — The White Queen
For everything else, we ’oogle. This will find more mentions of “triple red” here.
This is what you get by typing those 2 words in quotation marks into the Search box:

http://budgetlightforum.com/search?q_as=%22triple%20red%22

Aluminum stars. For almost double copper is the way to go (Sinkpad II or Noctigon) max fot red is about 1900/2000ma.

Colour perception in our brain is generated by the ratio of the excitations picked up by the three types of colour cones, it is actually a brilliant data-analysis of a very primitive three-receptor system (would you design the sensitivities of the green and red receptor so close to each other?). As you can see in the graph below, above ~670nm nothing is picked up anymore by the green receptor, just the red receptor 'sees' something. However smart it is, above 670nm your brain can not use the ratio between different receptors anymore to distinguish the colour, it gets just information from one receptor, so all light above roughly 670nm will appear the same colour (deep red). Going to higher wavelengths than that, the red receptor just becomes less sensitive and the light will appear dimmer, but not a different colour.

(there may be some variation among the population of humans, but this is roughly the story)

Been building PT54s for four years some up to 12A aspheric. Built GREEN PT121 aspheric at 25A+.

Told you it was beyond my pay grade…hehe…in all seriousness, this is brilliant stuff. Never heard it explained like this. Would like to have a long conversation about this, and how it could relate to hunting.

Great info, thanks.
I’ve located some Cree 670nm on Mouser. I think that is the perfect color. Now I need a driver for my triple-emitter plan…

People wondered for a long time why there was that odd gap* between blue receptor sensitivity and the red and green.

Surprise — that band is used both by the rods (night vision, and for motion and edge detection in brighter light)

and by the blue-green receptor (which regulates sleep, not used for vision)
http://panda.salk.edu/pdf/emergingrolesofmopn4.pdf

(This whole area is new and research is very active)

Age makes quite a difference, which the naked-eye astronomers talk about here:

And no, I didn’t know much about this ’til I started poking around.
Every time I ’oogle the subject there’s new information.

This page is kinda wonderful. Complexity upon complexity:
http://www.handprint.com/HP/WCL/color1.html#receptors

including some more info about the

and also

i’ve build about half a dozen lights with deep red, problem with exotic reds is that they do not illuminate as good as 620nm red, driven by the same current.

That sounds like a good thing, except that I imagine it only seems brighter because a second receptor (the green one) starts activating. I am sticking to 670.

Does anyone have a link to color example chart comparing the different red colors?

One of these may help:
do an image search, like this: http://www.google.com/search?q=red+LED+wavelengths&tbm=isch&tbo=u&source=univ&sa=XQsAQIIw

Color reproduction on a computer monitor (not to mention HTML encoding of colors on web pages) may be closer than you think, or not.

Thank you, that was very helpful. I guess I wasn’t typing in the right stuff. It looks like the deep red would be better for saving night vision.

Richard at mtn is too busy right now to do a build. I have pmed 18 six fifty. We’ll see what he says.

Thanks