Red lens lumen output ?

36 posts / 0 new
Last post
kiriba-ru
kiriba-ru's picture
Online
Last seen: 4 min 2 sec ago
Joined: 01/17/2016 - 02:34
Posts: 1162
Location: Russia

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.

Meanwhile in Russia: https://twitter.com/CrazyinRussia

maukka
maukka's picture
Offline
Last seen: 18 min 11 sec ago
Joined: 12/31/2015 - 04:15
Posts: 814
Location: Finland

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

MonicaMO
MonicaMO's picture
Offline
Last seen: 5 hours 53 min ago
Joined: 09/12/2017 - 23:25
Posts: 14

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
maukka's picture
Offline
Last seen: 18 min 11 sec ago
Joined: 12/31/2015 - 04:15
Posts: 814
Location: Finland

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
kiriba-ru's picture
Online
Last seen: 4 min 2 sec ago
Joined: 01/17/2016 - 02:34
Posts: 1162
Location: Russia

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.

Meanwhile in Russia: https://twitter.com/CrazyinRussia

Pages