Luminus SST-20 CRI95 seems to be over 100 cd/mmĀ² though the precision of my calculations is too low to call it definitive:
CRI70 variant is over 100 for sure. Iām sure Iāve see it tested somewhere but canāt find it nowā¦.
Luminus SST-20 CRI95 seems to be over 100 cd/mmĀ² though the precision of my calculations is too low to call it definitive:
CRI70 variant is over 100 for sure. Iām sure Iāve see it tested somewhere but canāt find it nowā¦.
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Boost HX or colored flat?
Looks like 1 mmĀ²!!??
Havenāt heard about it before but CULNM1.TG is a thing:
https://www.arrow.com/en/products/kw-culnm1.tg-z8pf5-ebvffcbb46-65g5/osram-opto-semiconductors
ADDED:
And Osram is phasing it out:
https://www.mouser.com/PCN/Osram_Opto_Semiconductor_1_cip_OS_NFND_2018_008.pdf
4040-size and 1mm2 die, hmmm
Throw the bone to the dogs L4P
It looks like 2mm2 led to meā¦ But lets wait and see what will L4P say.
1 mmĀ², CULNM1.TG aka Boost HL. And itās already tested:
Than it seems we spammed The Drivers thread
I already added it and linked to the test.
Iām guessing this is nothing too interesting:
https://www.samsung.com/led/automotive/automotive-leds/i-series/3w-white/
Iām not too adept at reading datasheets to determine such things though.
Iām not that great at Datasheets either. But it seems to have package size just a bit bigger than XP, and die size about the same as OSRAM White Flat. It is rated for 385lm from 3.0V and 1.0A current. Iād like to see djozz test it! :partying_face:
After quick look it looked like a winner.
But looking closer: itās rated for mere 1.5A which seemed suspicious (White Flat is 3A).
Output scales nicely with current but Vf grows fast. So efficiency drops quickly.
I donāt expect it to challenge Osrams but Iād like to see it tested as well.
Can someone share some ways to measure or calculate [cd/mm2]?
I know how to measure cd and know my area size.
I have lumen tube, lux meter, laser power meter, and other equipment.
I never got around to actually calculating this value but now it is quite important to know because I am building LEP
Regards Xandre
Several ways.
Thanks for the information.
Sorry, I am still a little confused on how to put everything together.
Like how you can get throw from know Lux and Distance alone, is there a way to know die illuminance in a similar way?
@Xandre
I have a lumen tube that can get OTF lumens. However, I do not have an integrating sphere so I am unable to get exact lumen measurements from the bare die I am trying to measure.
Do I enter 180deg as my apex angle?
@Agro
If I were to measure a bare die with a Lux meter, what would the general equation be?
Would I need to measure at different angles to know my emission pattern in an equation?
For example:
Lux meter @ 1meter = 150lux
die area = 0.04mm2
150 lux @ 1m = 150cd
150cd / 0.04mm^2 = 3750cd/mm^2 (very unrealistic, only short arcs can get this intense, LEDs are 10x less)
Anyway, you multiply that by the front area of your reflector/lens (again in mm^2) to get cd again.
(For example a 25mm diameter lens has area 491mm^2, which would be 1.8 million cd with that impossible tiny LED)
Letās ignore the optic and just focus on the 150cd from earlier.
You use cd to get the throw using the inverse square law of light.
(150cd / 0.25) ^0.5 = 24.5m
This is the distance where your luxmeter would read 0.25 lux (ANSI standard for throw)
You can also check in reverse:
24.5^2 = 600, which means the lux at 1m is 600x higher than that at 24.5m
And 600x 0.25 = 150 lux @ 1m
Wwow.
I just realized after reading your explaination. All I literally had to do was divide by my surface area! cd / area! Lol
Thank you so much for showing the relations between lux and cd. Everything finally makes sense.
Yup!
No prob