Do you understand basic electricity concepts? Volts, Amps, Watts (Power), etc? You’ll never have a real grasp on this sort of thing if you do not, that’s just how it is. If you DO understand the very basics then you can pigyback LEDs on that (they are special). Take a look at my posts in these two short threads:
Also be sure to go back and at least skim lagman’s thread I referred you to earlier.
If you want “help” (guidance) and not “being told what to do” you’ll need to do two things:
- increase your understanding of what’s possible and how this works
- make some decisions as to what kind of light you want this to be
For example, your tentative choice of the LD2C… it can supply 3A to a single LED. Something like 9W of output power. That’s all it’s been tested to do. That’s like one regular EDC flashlight for most of us, nothing impressive at all. You said you wanted powerful, I assume the equivalent of an everyday carry flashlight is not what you were thinking of.
EDIT: And FWIW I don’t 100% agree with Fritz t. Cat. Your host probably won’t do well with continuous direct drive (DD) at high current. I’d say the best thing is to implement a DD driver with turbo stepdown if you wanted to get close to “true” DD performance but be able to operate the light for more than 60 seconds at a time without damage. Even a showoff light has to stay on for a couple of minutes sometimes.