12v DC is not even useful for LEDs as it requires current limiting resistors - hence power wasted to heat. The proper (efficient) way to drive LEDs is via const

12v DC is not even useful for LEDs as it requires current limiting resistors - hence power wasted to heat. The proper (efficient) way to drive LEDs is via constant current source. I meant DC as in 230-330V DC for home/office use. I meant generally replace AC (high voltage) lines with DC ones.