Herschel Peeler
- Feb 21, 2016
- 401
- Joined
- Feb 21, 2016
- Messages
- 401
Is there a better way to judge LED brightness? I have a black plastic tube about 9 inches long and 8 ,, in diameter (internal) with a CdS cell at one end. I put the other end over the LED and measure the resistance of the CdS cell.
My most powerful LED is said to be 220,000 mcd a 100 ,mA. That gives me 600 Ohms. Dark gives me about 15K ohms. A 18,000 mcd white LED gives me about 1,500 ohms. I use these as my references.
I buy a lot of LEDs at bargain prices or by weight in bulk and try to judge brightness according to my black tube.
Is there any other way to judge brightness of white LEDs?
My most powerful LED is said to be 220,000 mcd a 100 ,mA. That gives me 600 Ohms. Dark gives me about 15K ohms. A 18,000 mcd white LED gives me about 1,500 ohms. I use these as my references.
I buy a lot of LEDs at bargain prices or by weight in bulk and try to judge brightness according to my black tube.
Is there any other way to judge brightness of white LEDs?