Only a 100 watt bulb needs to be 2500+ lumens to equal 150 watts (or more to 2900). My wife bought these for me to replace a lightbulb (150 watt) that gets very hot in the room. summer at my work. It just doesn't have nearly twice as bright light, and with our ceiling height, it's hard to see when working on projects. So I looked at some charts, it's about the 100 watt equivalent or something.