Clearly you two are talking about different LEDs. Looks like Loki uses through hole 5mm LEDs and Spuzzum uses high power LEDs that are SMT. These are two different types of circuits. Spuzzum needs a constant current source or he might get runaway due to heat, shotty power, etc. Loki has relatively low power diodes that will get away with a resistor on a DC supply just fine. Less heat and not much runaway to worry about. No need to flame when you are talking about two different things. I thought it was funny though. I would not run high power LEDs without some kind of constant current driver and over voltage protection.