Lumens to Watts 2 years ago calcgeek com 14 minutes Luminous Flux (φv) lm Select the Light Source Other light source Tungsten incandescent light bulb Halogen lamp Fluorescent lamp LED lamp Metal halide lamp High pressure sodium vapor lamp Low pressure sodium vapor lamp Mercury vapor lamp Luminous Efficacy (η) lm/W Power (P) W #Lumens #to Watts