Quickly determine the electrical power consumption of your lighting fixtures with our Lumens to Watts Calculator. Input lumens and light source efficacy to find the exact wattage required, helping you choose energy-efficient lighting solutions like LEDs or understand existing setups. Perfect for lighting designers and DIY enthusiasts.
Formula:
The fundamental formula to convert luminous flux (lumens) to electrical power (watts) is:
Watts = Lumens / Luminous Efficacy (lm/W)
Where:
- Watts (W): Represents the electrical power consumed by the light source.
- Lumens (lm): Denotes the total amount of visible light emitted by a light source.
- Luminous Efficacy (lm/W): Is a measure of how efficiently a light source converts electrical power into visible light. This value varies significantly by bulb type:
- Incandescent bulbs: ~10-17 lm/W
- Halogen bulbs: ~15-25 lm/W
- Fluorescent tubes: ~50-100 lm/W
- LEDs: ~80-150+ lm/W