Home & Household2 options compared

Lumens to watts calculator

Calculates the relationship between luminous flux (lumens) and electrical power consumption (watts) for various light sources. Users input a bulb's brightness measurement, or alternatively, enter the desired wattage output, and the tool determines the corresponding values needed to understand the efficiency of lighting fixtures. It helps users gauge the performance of different bulbs and LEDs...

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Lumens to watts calculator options compared

ToolBest forStrengthsLimitations
Omni Calculator
omnicalculator.com
Comparing bulb efficiency and savings
  • Comparison chart of LED vs other bulbs
  • Links to LED savings and electricity cost calculators
  • Explains formula and luminous efficacy
  • May include ads on the page
  • More features than needed for a simple conversion
RapidTables
rapidtables.com
Quick lumens-to-watts conversion
  • Simple input for lumens and efficacy
  • Predefined efficacy values for common light sources
  • Direct formula displayed on page
  • Fewer unit options compared to Omni
  • Typical/average efficacy values only

Buyer's guide

How to choose a lumens to watts calculator

When picking a lumens to watts calculator, consider whether you need only a basic conversion or want to compare bulb types and estimate savings. If you are shopping for replacements and want to see how different technologies stack up, a tool with a comparison chart is worth the extra clicks. If you just need the wattage number for a specific bulb quickly, a simpler calculator with predefined efficacy values will get you there faster.

Questions

Lumens to watts calculator FAQ

How do I convert lumens to watts?
Divide the lumens by the luminous efficacy in lumens per watt. For example, an LED bulb with 800 lumens and 10 lm/W efficacy uses about 80 watts.
What is a typical luminous efficacy for LED bulbs?
LED bulbs typically range from 80 to 100 lumens per watt, which is much higher than incandescent bulbs at around 10 to 17 lm/W.
Can I use this calculator to compare my current bulb with an LED?
Yes, if the tool includes a comparison chart or efficacy ratings for different bulb types, you can see the wattage difference for the same brightness level.
Why do some calculators show different wattage for the same lumens?
Because efficacy varies by light source. A calculator that lists predefined values for incandescent, halogen, LED, and other sources will give you a more accurate estimate for each type.
Is lumens to watts the same as watts to lumens?
They are inverse calculations. Use lumens to watts when you know the brightness and want to find power use; use watts to lumens when you know the power and want to find brightness.
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