Lumen Lux Watt Calculator
Convert watts to lumens (old bulb to LED) and calculate the illuminance (lux) for your room.
LED packaging states brightness in lumens, old incandescent bulbs are known by watts – and how bright a room actually feels also depends on its area (lux). This calculator connects all three values.
Pro tips
- A classic 60-watt bulb corresponds to a modern LED with about 700–800 lumens.
- Rough guide values: 100–300 lux for living spaces, about 500 lux at a desk, 750+ lux in a workshop.
Frequently Asked Questions
How many lumens does a 60-watt bulb have?
A classic 60-watt incandescent bulb produces about 700-800 lumens. When buying an LED replacement, look at this lumen value rather than the watt rating – LEDs need far fewer watts for the same brightness.
How do you convert lumens to lux?
Lux is calculated as lumens divided by the illuminated area in square meters (lux = lumens / m²). So 800 lumens in a 15 m² room works out to about 53 lux.
How many lux are ideal for a living room?
For living spaces, roughly 100-300 lux feels comfortable, a desk or kitchen usually needs around 500 lux, and a workshop 750 lux or more.
Why do LED packages show lumens instead of watts?
Watts measure power consumption, not brightness. Since LEDs are far more efficient than old incandescent bulbs, a watt rating would be misleading – lumens describe directly how bright the lamp actually is.