I'm designing a rather simple LED circuit as shown here:

I believe I have the resistor set properly and the LEDs configured properly too. Specs for the LEDs are here:
http://www.led2go.com/J800SE4LD.htm
When I hook everything up on a breadboard and connect a 12v power supply, none of the LEDs seem to light. Individually using a 3v PSU (it is the only thing close to 3.3v I have hiding around here), each LED lights properly.
There has to be something simple I'm overlooking...

I believe I have the resistor set properly and the LEDs configured properly too. Specs for the LEDs are here:
http://www.led2go.com/J800SE4LD.htm
When I hook everything up on a breadboard and connect a 12v power supply, none of the LEDs seem to light. Individually using a 3v PSU (it is the only thing close to 3.3v I have hiding around here), each LED lights properly.
There has to be something simple I'm overlooking...