Modern LED light bulbs (40W would be really bright!) can often handle a wide range of voltages, and some even can handle both DC and AC power. No matter what they'll shine as brightly thanks to built-in regulating electronics.
Modern LED light bulbs (40W would be really bright!) can often handle a wide range of voltages, and some even can handle both DC and AC power. No matter what they'll shine as brightly thanks to built-in regulating electronics.