Lumen (lm) measures how much light a lamp emits, while watt (W) measures how much energy it consumes.
The higher the lumen value, the brighter the light output. Wattage does not indicate brightness, only energy use.
With traditional bulbs, higher wattage usually meant more light. With modern LED lighting, this is no longer true: LEDs use less power while producing more light.
LED examples:
± 400 lumens ≈ 4–6 watts
± 800 lumens ≈ 8–10 watts
± 1500 lumens ≈ 12–15 watts
So when choosing lighting, focus on lumens for brightness and use watts to assess energy consumption.