Electronics > Beginners
Match LED Brightness
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mariush:

--- Quote from: wraper on November 04, 2019, 01:56:45 am ---
It's not like buying there will provide you with brighter LEDs. You can easily buy expensive LED from reputable manufacturer made with old technology and piss poor brightness. As far as it seems those LEDs have good enough datasheets according to screenshots.

--- End quote ---

Wasn't referring to brightness, but about how clear and easy to parse/read/understand datasheets are.
For example, see these which are 0.08$ at 100 : https://www.digikey.com/product-detail/en/lite-on-inc/LTST-C190KFKT/160-1434-1-ND/386812
Here's datasheet: http://optoelectronics.liteon.com/upload/download/DS-22-99-0186/LTST-C190KFKT.PDF

Has everything he needs to know... mCd rating , mCd rating depending on bin version (page 6) , charts on page 7 of the pdf
codingwithethanol:
@StillTrying
Thats a big yikes! The whole thing is going to run off a CR2032 so i'm trying to keep current to a minimum. Alot of these LED's i'm seeing are trying to pull 20mA.

@mariush
Yeah i'm restricted to parts from JLCPCB's part library, so we can get the badges fully assembled. Trying to see if I can find some not so scuff LEDs in the list.

@wraper
Not so much brightness that i'm concerned with, just uniformity.
wraper:

--- Quote from: codingwithethanol on November 04, 2019, 02:38:39 am ---@StillTrying
Thats a big yikes! The whole thing is going to run off a CR2032 so i'm trying to keep current to a minimum. Alot of these LED's i'm seeing are trying to pull 20mA.

--- End quote ---
They are not trying to pull anything. Small LEDs usually have 20 mA maximum current rating. Actual current depends only on you. If you are concerned about battery life, select brightest (most efficient) LEDs thus needing lowest current for required brightness.

--- Quote ---@wraper
Not so much brightness that i'm concerned with, just uniformity.
--- End quote ---
Then you don't need to change LEDs to begin with. Just select current limiting resistors to get required brightness.
StillTrying:

--- Quote from: codingwithethanol on November 04, 2019, 02:38:39 am ---@StillTrying
Thats a big yikes! The whole thing is going to run off a CR2032 so i'm trying to keep current to a minimum. Alot of these LED's i'm seeing are trying to pull 20mA.
--- End quote ---

I don't know about SMD, but close up I can see a Super bright 5mm blue lit at less than 1uA, they're very bright at 1 or 2mA.
sleemanj:
The best way to match an led for brightness, with a resistance decade box and your eyeball.

Decide on a resistor for one led that produces the brightness you want, then hook your decade box up for the second led and adjust until you find something that makes them match.




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