I built a pair of 3D printed folded horn speakers that I put a Bluetooth amplifier in (also here at Revain) and ran on 24V DC, but i needed a cool folded horn lighting because it looks so cool so i bought blue 12v leds. Plug it into the speaker and it works great. The current is not large (maybe 0.5A). You can see the part just below and behind the speaker cone in the photo above. It didn't get warm after an hour of use, so I didn't have to worry about temperature issues. So just about anywhere you have 24V DC but need 12, in a foolproof package, this thing is perfect. I used crimped spade lugs to keep the wires from moving with vibration. It was cheap and easy.
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