Might look a bit retarded, but that red filter-tape to use on busted taillights might work. Should be “Portland orange”, ie, “traffic red”, ie, orangey-red.
You could make your own filter to fit whichever light you like?
It would be easiest to order a small sheet of red film from Lee Filters. Cut it to the size of your lens, unscrew the bezel and put it right over the existing lens and re tighten the bezel. Or do the same with a piece of 1-2mm red plastic square from aliexpress. It’s tougher to cut though.
If you can get a filter on your hc60, I think it would be just enough for you.
If you want a dedicated red light then going with an xpg2 is definitely the way to go but if you want to still use white, obviously you need a filter:)
They make red G2s?
Not that I looked all that hard, but never heard of ’em before, only E2s.
I think you should buy something with a red led, but, it may still not have the reach you want
this red plastic Lee filter is a no-go, because 1000 lumens will melt it
besides, filters are rated for how much light they transmit, and the number is really small on this Red Filter
the math would be 1000 lumens, times 0.086 = 86 lumens… iow you would lose 91.4% of the lumens.
you could ask Fenix what the light transmission rate of their red filter is
then again, maukka has shown that the red filters he tested lose about 80%, so your 1000 might become 200 lumens, and I don’t think that will reach 50meters
thanks for the link
not sure how likely it is that will reach 50 meters
the only lumen specs I found say:
Lumen:160
I have had good luck putting used glass 52mm photo filters In my maglite they drop in after removing the aluminum ring.
50M from a head lamp?
Our eyes are much more efficient at seeing in green tan red(is green an option?)
Aha, 50 meters… :person_facepalming:
I think you will need larger optics for that.
Hmmm… That’s not a lot…
That red lee filter above is a deep red. They have others that are slightly orange and transmit 50%. And they don’t melt in a standard 1000 lumen headlight like my h03. I’ll put it on there and rest how far I can see when I get a chance.
This is the proper way of measuring how a filter affects light ^
It all depends on the % transmission at every wavelength of the filter, and the % emission at every wavelength from the LED.
It is impossible to figure this out without direct testing unless someone has specifically measured the spectral emission of the LED and absorption of the lens.
that is 41% transmission
it would reduce 1000 lumens to about 410 lumens
imo, the OP needs to question their assumptions about using red light for a 50 meter distance
it starts with an assumption that fish cannot see red, which for the most part is true
however, some also cannot see yellow nor orange, and those filters have much higher transmission
for example, here is a yellow that transmits 80%, meaning 1000 lumens would be about 800…
then again, some fish will be attracted by light, so Im not even sure its a bad idea to use plain cool white, and the OP has a 1000 lumen light they like
there is even info online regarding the use of green light to attract fish…
A fishing light attractor can also be white light because a portion of its total energy is in the blue to green region.
Here is a green filter with almost 71% transmissivity (710 lumens from 1000)… and, LEDs are very good at making green light, even Cool white leds…
so, instead of trying to hide the light from the fish, how about using the light to attract them 
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.
Cool idea, I can probably check a couple of emitters with different filters later this week.
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 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.
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.
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.
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
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.
