Only a 100 watt incandescent lamp needs to have more than 2500 lumens to match a 150 watt lamp (or more to 2900). My wife bought this for me to replace a lightbulb (150 watt) that is too hot in the summer when I 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.