According to Energy Star, a standard 100-watt incandescent light bulb emits 1,600 lumens of visible light. The luminous efficacy of an incandescent light bulb is set at 16 lumens per 1 watt.
A lumen (lm) is a unit for measuring the brilliance of a visible light based on the sensitivity of the human vision. One lumen is roughly equivalent to the intensity of light emitted by a single lit candle.
The packaging of most modern light bulbs bears an indication of the number of lumens that the bulb can produce. Since the color of light also affects the amount of lumens that can be emitted, the lumens indicated on the packaging of light bulbs represent the brilliance produced by the soft yellowish color that incandescent light bulbs emit.
Energy Star states that a 40-watt bulb will produce 450 lm, 60-watt 800 lm, 75-watt 1,100 lm, 100-watt 1,600 lm and 150-watt 2,600 lm.