How do I properly use this "Buck Toot"?

[Arduino420]

Hi there. I saw this and it seems useful, but before I buy it, I would like to understand more about how to use it. Thanks! Steve

https://www.sparkfun.com/products/9642?

[fungus]

Looks to me like you connect volts at one end and an LED at the other. The LED will receive 350mA current.

It seems expensive for what it is though. I guess it's because it's so small.

(350mA is usually for 1W LEDs...)

[abrookfield]

it says "does not require external current limiting resistors or additional heat sinking"

IT DOES NOT MEAN Your 1W led's don't need a heatsink

[Arduino420]

k thanks! Karma given! steve