Watts to Lumens Calculator

How It Works

At the core of the Watts to Lumens Calculator is a simple equation:

${\mathit{\Phi }}_{\mathbf{v}}\mathbf{\left(}\mathit{l}\mathit{m}\mathbf{\right)}\mathbf{ }\mathbf{=}\mathbf{ }\mathit{P}\mathbf{\left(}\mathit{W}\mathbf{\right)}\mathbf{\times }\mathit{\eta }\mathbf{(}\mathit{l}\mathit{m}\mathbf{/}\mathit{W}\mathbf{)}$

Here's a breakdown:

This equation forms the basis for translating electrical power into visible light output, providing insights into the brightness you can expect from a specific amount of power.

Lumens to Watts Calculator

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Using the Calculator

1. Enter Power: Input the power of your light source in watts.

2. Luminous Efficacy: Specify the luminous efficacy, usually in lumens per watt (lm/W).

3. Get Luminous Flux: The calculator will display the brightness in lumens based on your inputs.

This process allows you to understand how much light a specific amount of power will produce.

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Manual Wattage Calculation

Sometimes, manual calculations are necessary, especially for low-wattage LEDs. The formula is:

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

This equation helps you determine the power your light source needs to achieve a specific brightness.

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Finding Luminous Efficacy

To find the luminous efficacy of a bulb when you know its power and luminous flux, you can rearrange the formula:

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

This equation allows you to assess how efficiently a light bulb converts power into visible light.

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Frequently Asked Questions