kicad-developers team mailing list archive

[Kerusey Karyu <keruseykaryu@xxxxx>]

Dick Hollenbeck on Mon, 10 Jun 2013 15:37:43 wrote:
>
> Do SMT LEDS light on their backside?  If show, could a
> person not use a normal SMT LED for this and simply put
> a NPTH in the middle of the two pads?
>
> Thanks,
>
> Dick
>

If you look "a bit closer" to the LED chip, you will see a metal 
(usually copper) substrate which refuse to emitting light in that way. 
Adding with a ceramic base of each SMT LED this makes a solid barrier 
for a light, even for a reflected light.
So, the answer is: No.

http://www.semileds.com/system/files/SemiLEDs_EV_chip_e-catalogue.pdf

Regards
Kerusey Karyu