Red lens lumen output ?

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kiriba-ru
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Have one idea, cant keep it inside.
Can we use some sort of red filters to determine CRI (R9) with simple lux meter? Just to sort out most “rosy” leds from random reels and other leds with unknown tint.

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maukka
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Cool idea, I can probably check a couple of emitters with different filters later this week.

MonicaMO
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I have a customer whom asked for customized headlamp in two color switches few days ago.

Our regular headlamp along with the powerful white color light. And the required one is blue light.

After reprocessed, both colors LED light in the customized item looks good.

Therefore, we try to create more various color lens on the headlamp design.

If it applied in fishing, normally +500 lumens is enough.

I am a fresh bird of LED Flashlight, but I do like the LED Flashlight, especially in tactical flashlight.

maukka
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I tested a couple of lights with different CRI using different filters. Ended up testing with Lee 787 “Marius Red”, which block a lot under 650nm. With less stark red filters like the 106 “Primary Red” or 507 “Madge”, the difference between lights is smaller.

I don’t believe it’s possible to make any hard conclusions about small CRI differences, since the CCT of the LED plays a big part. Warmer emitters naturally lose less of the output. The 3700K XHP50 CRI73 on the Olight H2R pretty much matches the 4200K XHP35 HI CRI82 on the Zebralight SC600w III HI.

Still, if you have about 1% or more left of the output after the Marius Red filter, it’s very likely a CRI90 emitter. The 219C in the D4 surprised me with its high number. With a cool white CRI70 emitters you’ll only have about 0.5% left.

I would also like to test with a filter which passes a very narrow band at 470-480nm. Most low CRI emitters have a significant drop on cyan. There’s one Lee filter which is pretty close, the 727 “QFD Blue”, but I didn’t have time to test that yet.

kiriba-ru
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Any measurements with filaments or other non-led home lights?
Is there any chance that I can use parts of truck brake lights instead of special filter?
Upd.
Couldnt found red brake light plactic right now. Tried orange-yellow reflecting element. Hard to make any conclutions.
XM-L 3C – 12.5%
XP-L 3D – 6.4%
219A 3500K – 10%
XP-G2 2900K – 9%
219B 92CRI – 7.5%
Cheap 5630 strip, near 3000K – 22%
I dont understand how, but seems that this orange retroreflector helps to recognize greenish tint.

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ZoomieFan
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bella-headlight wrote:
My question is because I want a red light headlamp for night fishing using surface lures to not spook the fish.
I still need to illuminate about 50m if possible.
I have not found a commercially available headlamp with a strong red output just lamps with red leds secondary to the main white & only putting out say 13 lumens such as the Nitecore NU10.
I have tried the red lens in my link on a cheap Chinese zoomie I have as I cannot find a red lens to fit any of my good powerful headlamps.
The Chinese zoomie is no more than 300 lumens, maybe only 200, & with the red lens fitted it is nowhere near enough light.
I have good headlamps with from 1000-1500 real lumens (Nitcore HC60, Olight H35 etc) but cannot get red lenses for them.
I was wondering if I custom fitted a red lens to one of these good lamps what sort of output I could expect ?

Just a suggestion, consider green. Especially read the last link. You need much less lumens to see with green light, than you need with red light.
Quote:
The visual threshold for perception of red illumination with the low light rods is many times higher than the green threshold of the bright light cones! Second, recognize that there’s also very little difference between the sensitivity of the cones and rods at the red end of the spectrum. This shows why red light must be excessively bright to see with. Third, note the difference of minimum illumination intensity required to see red as opposed to green.

Colors
Red=higher contrast, more detail, not visible from a distance, doesn’t impair night vision
Green=doesn’t scare animals or attract bugs, can’t be seen from the side, attracts deer. More contrast and sharpness
Blue=doesn’t impair night vision, detect blood and bodily fluids, ideal for reading because it give superior contrast to black on white, cuts trough fog.

Myth: Best for night vision is spectrally pure red, second is primary red.
Fact: Green requires far less lumen to be visible, therefore is the better choice.
When you can see color night vision has been compromised.

http://www.vision-doctor.com/en/coloured-light-coloured-objects.html
http://www.vision-doctor.com/en/colour-filters.html
https://www.itstactical.com/intellicom/tradecraft/navigating-the-dark-ho...
http://www.astromax.org/activities/members/kniffen.htm

Chargers: 1xBasen BD01 5/5,1xDodge Charger, LiitoKala: 3xLii 100 4/5, 2xLii 202 5/5, 1xLii 402 3/5., MiBoxer C4-12 3/5
Flashlights: BLF Q8 4/5, Convoy BD04 5/5, DQG Tiny III, FiTorch MR35 3/5, Zebralight H600Fc 3/5.
Powerbanks: EasyAcc 26800 mAh 3/5, Xtar PB2 

ARsee
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This is not a headlamp, it’s the Acebeam K70 with the FR10 Lens @ 3m white wall. Compared to NW, (to my eyes) the red lens does not take away much lumen.

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