BLOOD Light

jch10400 · 2018-09-24T00:26:55.000Z

I have no idea how well they work (never had a reason to track a blood trail) but Bushnell makes the TRKR (short for tracker) series of lights. I bought one when Walmart was selling them cheap, I think mine is the 250 lumen model. There is a white LED in the center and I think three red and three blue LED’s in a ring next to the benzel. Only one color can be lit at a time. I only use mine for walks at a local nature preserve that requires a red light if you carry a flashlight.

Funner · 2018-09-24T00:36:43.000Z

I’m looking at the Bushnell, Gerber, Rayovac, and Primos blood lights. Amazon has a add on item light for $6.52 I will try, along with one of the Walmart lights.

Amazon Rayovac blood light. Amazon.com

Funner · 2018-09-24T00:47:29.000Z

Solarforce has a 450nm p60 drop in.

http://kaidomain.com/S023004-Solarforce-LC-UV-Ultra-violet-450nm-LED-Drop-in

moderator007 · 2018-09-24T01:36:49.000Z

Here’s a cheap 450nm Ultrafire on Ali. Have no idea if its any good.
https://www.aliexpress.com/item/450nm-Blue-light-Outdoor-Lighting-Flashlight-Gray/32917726196.html?

Barkuti · 2018-09-24T02:12:55.000Z

xpebbl (XP-E2 blue) search @ arrow.com

XPEBBL-L1-0000-00301 is the highest flux bin, dominant wavelenght range 465 - 485 nm.

xpgdry (XP-G3 royal blue) search @ arrow.com

Looks like very recently they got a reel of highest flux bin units, right now I see 1000 units of XPGDRY-L1-0000-00601 in stock and selling 'em by the piece. (^̮^)

Cheers ^:)

Lightbringer · 2018-09-24T03:46:17.000Z

Funner:

Solarforce has a 450nm p60 drop in.

http://kaidomain.com/S023004-Solarforce-LC-UV-Ultra-violet-450nm-LED-Drop-in

That might fit a Solarforce light like the L2 series, but I seriously doubt it’s a SF module.

First, I don’t think they’d have the nerve to call a 450nm blue LED “ultraviolet”.

Second, a simple 1-mode driver isn’t rocket-surgery, so probably is just a bunch of cheap parallelled chip-resistors.

17bux for that? Feh…

Henk4U2 · 2018-09-24T08:35:07.000Z

Lightbringer:

Henk4U2:

Have done some reading. You need a light source with appr. 465nm wavelength.

That would be violet(blue). Some grow lights are 465nm. NB Royal Blue is 440nm-450nm.

Violet would be about 405nm. 470nm is “sapphire blue”.

465nm would be close to the latter, so that’d be a nice purty blue.

Obviously quoted the wrong source when I wrote that 465nm is violet(blue).
But then again: I’m colorblind. Awkward.
A bit like Mendel, the founder of genetic’s and very reluctant sharing his own gene pool.

Did a bit more reading: the words Coleman light keep popping up.

klrman · 2018-10-01T22:43:49.000Z

Lightbringer:

Henk4U2:

Have done some reading. You need a light source with appr. 465nm wavelength. That would be violet(blue). Some grow lights are 465nm. NB Royal Blue is 440nm-450nm.

Violet would be about 405nm. 470nm is “sapphire blue”. 465nm would be close to the latter, so that’d be a nice purty blue.

Where would I find a 465nm blue already mounted on a 20mm copper DTP board to fit a C8 host? How bright would a 465nm be, anyone know?

Cereal_killer · 2018-10-01T22:54:43.000Z

klrman:

Where would I find a 465nm blue already mounted on a 20mm copper DTP board to fit a C8 host? How bright would a 465nm be, anyone know?

465nm is what Cree calls royal blue.

From RMM here

klrman · 2018-10-01T23:00:37.000Z

Cereal_killer:

klrman:

Where would I find a 465nm blue already mounted on a 20mm copper DTP board to fit a C8 host? How bright would a 465nm be, anyone know?

465nm is what Cree calls royal blue. “From RMM here”:http://www.mtnelectronics.com/index.php?route=product/product&path=60_78&product_id=751

Thanks for the link. They rate it as Estimated Output @ 350mA: 575mW. I'm no expert, but what is that about....50 lumens?

Cereal_killer · 2018-10-01T23:12:06.000Z

Probably a good guess, maybe a little higher on DTP with a good lens. The lowest current I run one at is 700mAh and it’s behind the wide ledil CUTE pebble finish that Dale estimates to cause a ~33% optical loss and it measures 97lm in my light box.

Do keep in mind it will actually be much more power output than 97lm of white light, it can give you a headache pretty quickly. The cheap meters probably read narrow band color light lower than reality as well.

Cereal_killer · 2018-10-01T23:28:43.000Z

Might I suggest the royal blue XT-E. Same target wavelength as the XP-E2 but they’re designed to be extremely true to their binning. Binned into 2.5nm groups (so you can be sure that 465nm led you purchase will be almost exactly 465nm). Max drive current is spec’d at 1.5A (vs 1.0A spec for the XP-E2)!

Also the XT-E will throw better if you’re not planning to dedomed the XP-E2 (the XT-E can’t be dedomed and if you did dedome the XP-E2 it would then beat the XT-E in throw).

Barkuti · 2018-10-02T00:12:23.000Z

https://www.arrow.com/en/products/search?q=xteary&filters=In+Stock:Yes;

Closest to 465nm one seems to be the N08.

Jerommel · 2018-10-02T00:24:23.000Z

So, how is blue gonna help spot blood?

Jerommel · 2018-10-02T00:27:28.000Z

Cereal_killer:

klrman:

Where would I find a 465nm blue already mounted on a 20mm copper DTP board to fit a C8 host? How bright would a 465nm be, anyone know?

465nm is what Cree calls royal blue.

From RMM here

Strange.
470nm is “blue” and 450nm is “royal blue” usually.

klrman · 2018-10-02T01:45:46.000Z

Cereal_killer:

Might I suggest the royal blue XT-E. Same target wavelength as the XP-E2 but they’re designed to be extremely true to their binning. Binned into 2.5nm groups (so you can be sure that 465nm led you purchase will be almost exactly 465nm). Max drive current is spec’d at 1.5A (vs 1.0A spec for the XP-E2)! Also the XT-E will throw better if you’re not planning to dedomed the XP-E2 (the XT-E can’t be dedomed and if you did dedome the XP-E2 it would then beat the XT-E in throw).

Good info, thanks. Don't want to dedome, so maybe I'll go with an XT-E.

klrman · 2018-10-02T01:50:47.000Z

Barkuti:

https://www.arrow.com/en/products/search?q=xteary&filters=In+Stock:Yes;

Closest to 465nm one seems to be the N08.

Thanks! They are offering right now free shipping to Canada with no order minimum. If I get the N08, then I'll have to get a star and then try and figure out how to mount the led on the star. Never did that before yet.

Barkuti · 2018-10-02T04:17:16.000Z

Dominant wavelenght range is 457.5 - 462.5nm for the 08 kit code. Quite good emissivity at 465nm thus it should provide. Closest kit code is 06 (460 - 465nm DWL range), but found nothing.

If you have never reflowed surface mount components it may be a good idea to ask for help if you have some expert at hand, or learn by yourself. Buy some extra spare blue emitters and maybe a bunch of cheapies to try and burn. Cheap copper MCPCBs here if interested.

Careful lay out of the solder paste, emitter placement, press down and paste excess toothpick removal, slow temperature ramp up and down, tight control of the temperature window, etc. There are some reflow diy videos out there, practice and calmness are good allies.

These XT-Es are not the cheapest, look for example at XP-G3 royal blue emitters for comparison. Highest flux bin Opulent Americas starboard mounted emitters available, by the way. No idea if those are DTP stars. That option may still work nice enough.

Cheers

P.S.: Aaah! Didn't noticed it was you klrman, thanks a lot again. :-)

klrman · 2018-10-02T04:37:23.000Z

Cheers Barkuti, you're welcome

Ok, I have to give it a go and get some cheap emitters and learn how to reflow. Thanks for all the above info, very helpful

Henk4U2 · 2018-10-02T11:30:56.000Z

Jerommel:

Cereal_killer:

klrman:

Where would I find a 465nm blue already mounted on a 20mm copper DTP board to fit a C8 host? How bright would a 465nm be, anyone know?

465nm is what Cree calls royal blue.

From RMM here

Strange.
470nm is “blue” and 450nm is “royal blue” usually.

I read the same in the litterature but hé, I’m red-green colorblind.
Or as the waiter Manuel in ‘Fawlty Towers’ always says: “I’m from Barcelona, I know nothing. Noo-thing”.
But here is a picture that says you are correct:

As for bloodtracking, these are the two most prevalent opinions

- take a flashlight with a green led and a red led, throw in a special filter and ALL red objects stick out like a sore on a baby b* while the rest gets a brown blurr.

take a flashlight with a blue led, and the blood becomes a black spot while the rest basks in the blue light. Because the absorption spectrum of bloodplasm matches the emission spectrum of the blue led.