# Lumens to Watts Calculator

Find the right wattage for your lighting needs with our Lumens to Watts Calculator. Ideal for energy-efficient lighting planning.

Enter luminous flux in lumens:
lm
Enter light source:
Or enter luminous efficacy in lumens per watt:
lm/W
Power result in watts:
W

Whether you're a lighting enthusiast, homeowner, or professional in the lighting industry, this calculator is here to help. Let's explore how it works and why it's valuable.

How It Works: At the core of the Lumens to Watts Calculator is a straightforward equation:

$P\left(W\right)=\frac{{\Phi }_{v}\left(lm\right)}{\eta \left(lm/W\right)}$

Here's a breakdown:

Understanding this equation empowers you to determine the power your light source needs to produce a specific brightness. It's a key tool for informed decisions in selecting the right lighting solutions.

Watts to Lumens Calculator

## Using the Calculator

1. Enter Luminous Flux: Input the brightness of your light source in lumens.

2. Luminous Efficacy: Specify the luminous efficacy, usually in lumens per watt (lm/W). The default is set at 100 lm/W, a common value for LEDs.

3. Get Power: The calculator will display the required power in watts based on your inputs.

This process ensures you can accurately match the brightness you desire with the appropriate power consumption.

## Conversion Chart

For quick reference, a conversion chart is provided, showing the wattage requirements for different levels of brightness for a light source with a specific luminous efficacy.

For example:

• 5 lumens = 0.0555 W
• 10 lumens = 0.111 W
• 20 lumens = 0.222 W
• 50 lumens = 0.555 W
• 100 lumens = 1.111 W
• 5000 lumens = 55.555 W

This chart simplifies the process of choosing the right bulb for your needs.

## Exploring Efficiency

The Lumens to Watts Calculator is not just about brightness; it's also a tool to evaluate the efficiency of different lighting solutions. This is particularly useful when considering low-wattage LEDs, providing insights into potential electricity savings.