I think it's more an efficiency thing: there's no point in paying a lot for an expensive efficient LED and wasting over half the power in a resistor which also requires a large heat sink.
It you don't need current regulation then a good way of driving a power LED is to just use an oscillator (e.g. a 555 timer), MOSFET, Schottky diode and inductor - it's cheap, efficient and achieves similar current regulation to a resistor.
How much current does the LED require? Don't give the absolute maximum rating, give the recommended operating current.
What's the typical forward voltage?
What's the voltage range of your power supply?