PUFFRBELLY posted:...All that being said, I'm pretty sure I'm going to go the "Buck Converter" route. I have one that is AC input with a variable DC output which I can adjust for the 16 volts needed to run the LED's.
That works too. You might find when you set the Buck Converter to 16V DC with the 22 ohm resistors, your floodlight will be a tad brighter than when powered by 16V AC as per your initial diagram. Perhaps obvious, but since the Buck Converter voltage can be adjusted, you can lower the brightness by lowering the voltage (rather than messing with different resistor values). I'd guess the LEDs with 22 ohm resistor will turn on dimly at about 10V DC and smoothly ramp up in brightness as you increase the Buck Converter output voltage to 16V DC.
