Watts to Lumens Calculator
Find out how much light a bulb will produce based on its wattage and efficiency rating.
Φ_v(lm) = P(W) × η(lm/W)
9W LED bulb (90 lm/W) = 9 × 90 = 810 Lumens
How do I convert watts to lumens?
Multiply the electrical power in watts by the luminous efficacy (lumens per watt) of the bulb. Formula: Lumens = Watts × Luminous Efficacy.
How many lumens is a 60-watt bulb?
A traditional 60-watt incandescent bulb produces about 800 lumens. An LED bulb can produce the same 800 lumens using only 8 to 10 watts.
What is the efficacy of different light sources?
LEDs typically have an efficacy of 80-100 lm/W, fluorescents about 60 lm/W, and incandescent bulbs only 15 lm/W.
🔗 Related Calculators
📐 Formula
Φ_v(lm) = P(W) × η(lm/W)
📝 Example Calculation
9W LED bulb (90 lm/W) = 9 × 90 = 810 Lumens
❓ Frequently Asked Questions
How do I convert watts to lumens?▼
Multiply the electrical power in watts by the luminous efficacy (lumens per watt) of the bulb. Formula: Lumens = Watts × Luminous Efficacy.
How many lumens is a 60-watt bulb?▼
A traditional 60-watt incandescent bulb produces about 800 lumens. An LED bulb can produce the same 800 lumens using only 8 to 10 watts.
What is the efficacy of different light sources?▼
LEDs typically have an efficacy of 80-100 lm/W, fluorescents about 60 lm/W, and incandescent bulbs only 15 lm/W.