# Lumens to Watts Calculator and How To Use It?

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Have you ever wondered how bright a light bulb is? Or how much energy it consumes? If you have, then you probably have heard of terms like lumens and watts. But do you know what they mean and how they are related? In this article, I will explain everything you need to know about lumens to watts conversion and why it is useful for comparing different light sources.

## Lumens to Watts Calculator

If you want to quickly and easily convert lumens to watts for different types of light sources, you can use our handy calculator below. Just enter the number of lumens you want to convert and choose the type of light source you want to compare. The calculator will show you the equivalent power in watts for LED, CFL, and incandescent bulbs. You can also see the difference in energy efficiency and cost savings between them. Try it out and see for yourself!

#### Lumens to Watts Conversion Table

Enter the number of lumens below and click “Convert” to see the equivalent watts for incandescent, CFL, and LED lights.

If you need to convert Candelas to Lumens, convert Lumens to Candelas, or convert Watts to Lumens here.

## What are Lumens and Watts?

Lumens are a measure of how much light a source emits. The more lumens, the brighter the light. For example, a candle has about 12 lumens, while a 60-watt incandescent bulb has about 800 lumens. Watts are a measure of how much power a source consumes. The more watts, the more energy it uses. For example, a 60-watt incandescent bulb consumes 60 watts of power, while a 10-watt LED bulb consumes only 10 watts of power.

## How to Convert Lumens to Watts Using a Formula?

To convert lumens to watts, we need to use a simple formula: watts = lumens / (lumens per watt). This formula tells us how much power a light source consumes for a given amount of light output. But what is lumens per watt? This is a term that describes how efficient a light source is at converting power into light. It is also called luminous efficacy. The higher the luminous efficacy, the more lumens per watt, and the less power is needed for the same amount of light.

The luminous efficacy of a light source depends on its type and quality. Different types of light sources have different ranges of luminous efficacy. For example, incandescent bulbs have a low luminous efficacy of about 15 lm/W, while LED bulbs have a high luminous efficacy of about 100 lm/W. This means that LED bulbs can produce more light with less power than incandescent bulbs.

Here are some typical values of luminous efficacy for different types of light sources:

- Incandescent bulbs: 15 lm/W
- Halogen bulbs: 25 lm/W
- CFL bulbs: 60 lm/W
- LED bulbs: 100 lm/W

- The rule of thumb for
**Incandescent lights**is 1 watt of power produces 12.5 to 16 lumens of brightness output. - The rule of thumb for
**CFL lights**is 1 watt of power produces 50 to 70 lumens of brightness output. - The rule of thumb for
**LED lights**is 1 watt of power produces 75 to 110 lumens of brightness output.

Using these values, we can use the formula to calculate the power in watts for any given luminous flux in lumens. For example, if we want to know how much power a LED bulb that emits 800 lumens consumes, we can plug in the numbers into the formula:

**watts = lumens / (lumens per watt) watts** = 800 / (100) watts = 8

So, an 800-lumen LED bulb consumes only 8 watts of power. That’s pretty impressive!

## How to Convert Lumens to Watts Using a Table?

But what if we don’t want to do the math ourselves or use our online Lumens to Watts Calculator? Is there an easier way to convert lumens to watts? Yes, there is! We can use a handy lumens to watts table that shows the equivalent power in watts for different values of luminous flux in lumens for different types of light sources. Here is an example of such a table:

Lumens | Incandescent | Halogen | CFL | LED |

200 | 25 W | 18 W | 5 W | 3 W |

400 | 40 W | 28 W | 9 W | 6 W |

800 | 60 W | 42 W | 15 W | 8 W |

1600 | 100 W | 70 W | 25 W | 16 W |

Using this table, we can easily find the power in watts for any given luminous flux in lumens by choosing the appropriate column for the type of light source and finding the closest value in the row. For example, if we want to know how much power a CFL bulb that emits 800 lumens consumes, we can look at the table and see that it is about 15 watts.

Here are some more examples of how to use the table to find the power in watts for different values of luminous flux in lumens for different types of light sources:

- How much power does a 40-watt halogen bulb emit in lumens? We can look at the table and see that it is about 400 lumens.
- How much power does a 25-watt CFL bulb emit in lumens? We can look at the table and see that it is about 1600 lumens.
- How much power does a 16-watt LED bulb emit in lumens? We can look at the table and see that it is about 1600 lumens.

## FAQ about Lumens and Watts

Here are some frequently asked questions about lumens and watts and their answers:

### What is the difference between lumens and watts?

Lumens measure the amount of light a source emits, while watts measure the amount of power a source consumes. The more lumens, the brighter the light. The more watts, the more energy it uses.

### How do I know how many lumens I need for my room?

The number of lumens you need for your room depends on several factors, such as the size of the room, the purpose of the lighting, the color of the walls and furniture, and your personal preference.The general rule of thumb that you can multiply the area of the room in square feet by 10 to get the minimum number of lumens you need is also accurate, but it is important to note that this is just a general rule of thumb. The actual number of lumens you need will vary depending on the specific factors mentioned above.

For example, a 100 square foot living room that is used for watching TV will need more lumens than a 100 square foot bedroom that is used for sleeping. This is because the TV will reflect light, making the room brighter. The color of the walls and furniture can also affect the amount of lumens you need. Darker colors absorb light, making the room feel darker and requiring more lumens to achieve the desired level of brightness.

Ultimately, the best way to determine how many lumens you need for your room is to consult with a lighting professional. They can help you assess your specific needs and recommend a lighting solution that will provide the perfect amount of light for your space.

Here are some additional tips for determining how many lumens you need for your room:

- Consider the activities that will take place in the room. For example, a kitchen will need more lumens than a bedroom because people will be cooking and preparing food in the kitchen, which requires more light.
- Think about the light fixtures you plan to use. Some light fixtures, such as recessed lights, produce more lumens per watt than other types of light fixtures, such as table lamps.
- Take into account the color temperature of the light. Warmer light (2700-3000K) produces a more relaxing atmosphere, while cooler light (4000-5000K) is better for tasks that require focus.
- Consider your personal preferences. Some people prefer a brighter light, while others prefer a more dim light. Ultimately, the amount of lumens you need is up to you.

You can also check out our posts on best smart lights for every rooms of your home here.

### How do I know how many watts I need for my light bulb?

The number of watts you need for your light bulb depends on the type and quality of the light source and the amount of light output you want. You can use the formula or the table above to convert lumens to watts for different types of light sources. For example, if you want a light bulb that emits 800 lumens, you can choose a 60-watt incandescent bulb, a 42-watt halogen bulb, a 15-watt CFL bulb, or an 8-watt LED bulb.

### What is the difference between lumens per watt and watts per lumen?

Lumens per watt is a measure of how efficient a light source is at converting power into light. It is also called luminous efficacy. The higher the lumens per watt, the more efficient the light source. Watts per lumen is a measure of how much power a light source consumes for a given amount of light output. It is also called power density. The lower the watts per lumen, the more efficient the light source.

## Tips and Tricks for Choosing the Right Light Source Based on Lumens and Watts

Here are some tips and tricks for choosing the right light source based on lumens and watts:

- Choose light sources that have higher luminous efficacy and lower power consumption to save money and energy. For example, LED bulbs are more efficient than incandescent bulbs.

- Choose light sources that have better color quality and brightness to improve your comfort and well-being. For example, LED bulbs have higher color rendering index (CRI) and more suitable color temperature (CCT) than incandescent bulbs.

- Choose light sources that match your purpose and situation. For example, use warm white light (2700K to 3000K) for cozy and relaxing environments, such as bedrooms and living rooms; use cool white light (4000K to 5000K) for bright and stimulating environments, such as kitchens and offices; use daylight white light (6000K to 6500K) for natural and accurate environments, such as art studios and workshops.

## Conclusion

In this article, we learned:

- What lumens and watts are and how they measure the brightness and energy efficiency of different light sources.
- How to convert lumens to watts using a formula or a table or our online Lumens to Watts converter.
- Why lumens to watts conversion is useful for comparing different light sources.
- Some FAQ about lumens and watts and their answers.
- Some tips and tricks for choosing the right light source based on lumens and watts.

We also wrote a poem about the relationship between lumens and watts:

Lumens and watts are two different things

Lumens measure the light that a source brings

Watts measure the power that a source needs

To produce the light that our eyes perceive

Lumens and watts are not the same

They have different units and different names

But they are related by a simple rule

That tells us how efficient a light source is as a tool

Lumens and watts are connected by a factor

That we call luminous efficacy or lumens per watt

The higher this factor, the less power we use

To get the same amount of light that we choose

Lumens and watts are useful to know

When we want to compare different light sources and their glow

We can use our calculator or a table to convert them with ease

And find the best light source for our needs

We hope you enjoyed this article and learned something new. If you have any comments or questions, feel free to leave them below or contact us for more information. And remember, when it comes to lighting, it’s not just about the watts, it’s about the lumens! Happy lighting and don’t forget to check out CondoChance.com for more lighting tips!

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## Batu of CondoChance Team

BSc. Electrical Engineer & MBA

10+ years of industrial experience as an Electrical Engineer