Is this the right configuration for LEDs?
I am building some LED aquarium lights and I need to know the configuration pictured below will work? The LEDs are white with the following specs: Forward Voltage 2.8-3.5V, 20mA. I used an online calculator and the resistor pictured as 'R1' is 1 ohm, does this sound right? The power supply is 9VDC 800mA. I believe that if each of the 3 LEDs in a set pull 3V, then no resistor would be required, am I right? I have basic electronic knowledge, but have never designed a circuit requiring resistors.