takao21106:
Grumpy_Mike:
What is worst are the morons that think resistors on LEDs are unnecessary.Resistors aren't really much used for power LEDs.
If a component is neccessary isn't defined by what someone thinks, but by the circuit, and the component specifications.
If arduino has constant current supply it would not need a resistor either but it has a constant (to certain limit) voltage supply instead. You are totally mixing up these two situations. The arduino is the constant voltage situation and a resistor is always needed.
Good idea NI$HANT, the more specific hardware will depend on local suppliers too so I wish there were lists for parts suggestions say USA/UK/Australia/India/... where lots are playing with Arduino.