How do led lights differ from fluorescent lights?

leds emit light by concentrating wavelengths of light; fluorescent bulbs emit light because of heat.
leds emit light because of energized solids; fluorescent bulbs emit light because uv light interacts with a phosphor coating.
leds emit light because of heat; fluorescent bulbs emit light because of energized solids.
leds emit light because uv light interacts with a phosphor coating; fluorescent bulbs emit light by concentrating wavelengths of light.