I just got a green 4 pin LED,
What do the following mean:
"High flux output"
960 mlm
...I understand the rest, i'm assuming that the forward current of 20ma means that it uses 20ma of power per hour.
Also, what use is a 4 pin LED good for or is this just a structural implementation? The LED is insanely bright when hooked to a cellphone battery - like retina damaging bright. There is no mcd attribute for this LED on the packaging.
The item: http://www.radioshack.com/product/index.jsp?productId=3125356 (http://www.radioshack.com/product/index.jsp?productId=3125356)
*please note the forum status 'newbie' :P
Jad,
From looking at the picture, It would appear that the 4 pins are actually 2 cathode and 2 anode connections used for structural mounting as you implied. Here is a website that might help you out with any questions regarding LED's.
http://www.theledlight.com/technical.html
P.S. I haven't seen the mlm rating used before ??
Hi,
960 mlm means milli Lumen
QuoteThe lumen (symbol: lm) is the SI unit of luminous flux, a measure of the perceived power of light.
http://en.wikipedia.org/wiki/Lumen_(unit) (http://en.wikipedia.org/wiki/Lumen_(unit))
Take care,
Michel
Thank you Both!
Yet another: Is there a such thing as a low voltage LED? ..something say, around the vicinity of .5 volts?
No, there is not, unfortunately.
Here is a colored figure attached for the different LEDs forward voltages in the function of their forward current, from the link: http://www.maxim-ic.com/appnotes.cfm/appnote_number/1883
White LED is not shown, it has an average 3.1 -- 3.2V drop for a 15-20mA forward current, just a bit less than for the blue LED.
So the red LED has the smallest drop of around 1.5V.
rgds, Gyula
PS Just found this useful 'arsenal' : http://www.densitron.com/displays/led_color_chart.aspx