Is there a 5 Amp ~35v equivalent to the LM-317T Voltage Regulator? Need to build 100w LED driver

Right now I'm running a 10w LED with a simple LM-317T & 1.8 ohm resistor combo. I'm looking to get a 100w led and build a driver for it.
Is there a voltage regulator I can buy with these specs, or does this cheap "hack" only go so far?

LED Specs:
100w
28-32v VF
3200mA IF


That's 10-18W of waste heat in the pass device, and another 5 in the dropper resistor - nearly 25% of the load power in the worst case.

These big things really need constant current switch mode regulators.

Steve
+1 - go with current regulated supply.