Conversion lumens to watts – Efficiency estimation solution

Conversion lumens to watts – Efficiency estimation solution

If you’re thinking about calculating lumens per watt, you’re probably shopping for bulbs. An easy way to understand these quantities about a bulb is to consider the number of watts as the energy input to the bulb and the number of lumens as the energy output. Just remember that is an approximation because lumens are actually units of brightness, not energy.

The number of lumens per watt is a characteristic of each bulb and a measure of bulb efficiency. It depends on a number of factors, including how the bulb produces light, the quality of the materials on which the bulb is made, and how much input energy is wasted as heat. The packaging tells you how much electricity each bulb consumes and how much light it emits. The number of lumens per watt is simply the ratio of these two numbers.

In this article, we will share with you how to conversion lumens to watts

What is Lumen?

Get ready for some science and math jargon you may not have heard before. One lum is defined in the SI (metric) system as the amount of luminous flux emitted per second in a unit angle of a steradian equal to a source of a candela. Steradian is simply an area far from r from the source by a circle of area r2.

What is Lumen?
What is Lumen?

The device dates back to a time when candles provided all light and luminance measured with candlesticks, which is still true in today’s lighting industry. If you place a candle one foot away from the wall and draw a square 1 foot on the wall, the amount of light illuminating that square equals one lum.

What is Watt?

One watt is a unit of energy in an SI system. In that system, work and energy are measured in joules, and because power is the speed at which the job is done, one watt equals one joule per second. Power in a circuit, which is equal to the voltage on the circuit multiplied by current, is also measured in watts.

What is Watt?
What is Watt?

The capacity of a bulb is how much energy the bulb consumes, and what electricity bill you will pay in the end. Energy doesn’t produce light, but you can’t convert lumens into watts and back because not all input energy goes into light production. The best thing you can do is to set the ratio of lumens to watts, which is the luminous efficiency of your bulb.

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Compare bulbs with a Watts versus Lumens chart

When you shop for light bulbs, you want to know how much the bulb produces and how much energy it consumes. You will find that information on the package. You can compare bulbs by consulting a watts chart with lumens that you can find online or in any lighting store. When you do this, you might be surprised by the amount of CFLs, LEDs, and even halogen bulbs that consume less energy to give you the same amount of light as an incandescent bulb.

Compare bulbs with a Watts versus Lumens chart
Compare bulbs with a Watts versus Lumens chart

For example, a 100W incandescent bulb produces about 1,600 lumens, giving an efficiency of 1,600 / 100 = 16 lumens per watt. On the other hand, a halogen bulb consumes only 72 watts for the same brightness, making its performance 1,600 / 72 = 22 lumens per watt. A CFL bulb consumes even less energy – just 26W – so its efficiency is 61 lumens per watt. Finally, the LED bulb, most efficient, consumes only 22 watts for an efficiency of 73 lumens per watt.

If you think about equivalent luminescence output, you will only need 22W of power for the LEDs to match the performance of a 100W incandescent bulb. This means LEDs have about five times lower operating costs than incandescent bulbs.

Conversion lumens to watts

1w equals how many lumens

  • In the past, when high-efficiency lighting was introduced, if we bought conventional incandescent or fluorescent lighting equipment, we often paid attention to Watts capacity.
  • Many people believe that the larger the Watts capacity, the higher the amount of light emitted and the brighter the lamp. But in fact, Watts is just a unit of measuring the amount of power consumed and the lamplight depends on lumens.
  • Thus, the higher the lumen index, the brighter the bulb, while Watts is the higher the power index, the more power is consumed.

Lumen = Wattage of Bulb x Luminous Efficacy

Conversion lumens to watts
Conversion lumens to watts

Lumen to watt panel

Lumens Ball




  / LED


375 lm 25 W 6.23 W
600 lm 40 W 10 W
900 lm 60 W 15 W
1125 lm 75 W 18.75 W
1500 lm 100 W 25 W
2250 lm 150 W 37.5 W
3000 lm 200 W 50 W

Are the parameters on the LEDs in lumens or watts?

– In the past, when buying lighting equipment such as incandescent or fluorescent lamps, we often paid attention to watts of wattage, and by default the larger the wattage, the brighter the lamp. This is only partially true.

In fact, the amount of light emitted from the bulb is measured in lumens, not watts, watts are only a measure of the power consumption of the light source only.

– When high-efficiency luminaires were introduced, buyers began to notice lumen units. Lighting experts also advise that consumers pay attention to this parameter written on the package or supplied from the manufacturer.

– Ordinary incandescent lamps only have an efficiency of about 10-20 lm/watt, fluorescent lamps are about 40-50lm / watt and the highest is LEDs from 80-100 lm/watt. Currently, there are high-end lamps that can reach 150lm / w.

– LEDs are considered to be energy-efficient because they provide large lumens of light (luminous flux) with small power consumption. Example: A 3W led lamp provides 300lm (100lm / w) luminous flux ~ 15w incandescent lamp (20lm / w) ~ 8w fluorescent lamp (40lm / w).

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Frequently asked questions

  • Was Lumen helpful?

For bulbs shaped like circles, spheres, candles, … the total lumen output is calculated for all directions. For this reason, some light sources may not be very useful in lighting but they are still counted in the total luminous flux (lumens).

From there, a concept was introduced with the aim of evaluating “useful lumens”. This is a useful measurement of light emitted in a light source within a 90-degree cone frame. The “useful lumen” rating is often lower than the total output luminous flux and provides a critical rating to the lamp manufacturing process.

LEDs provide luminous flux that is more useful than other lighting technologies because they emit directional light. But so, you can carefully check the Lumen parameters on the solar LED product lines to be able to understand and choose the right product for your needs and circumstances.

  • How many lumens (luminous flux) is required for a room

In fact, to be able to find yourself a certain number of lumens for a room will be very difficult because this will greatly affect each area, room type as well as some other factors such as the height of the ceiling, painted walls, interior decoration, and personal preferences. Each area will need a certain amount of lumens.


  • Kitchen: 300-400 lumens
  • Living room: 400-500 lumens
  • Corridor: 300 lumens
  1. Choose LED by  watts or lumens

Lumens: A measure of light emitted by a light source, whether it’s an LED, fluorescent, halogen, or incandescent light and it is also called luminance. Example: A standard 100-watt incandescent bulb produces about 1,500 – 1,700 lumens.

Watts: Not a measure of brightness; instead, it is a measure of the amount of electricity (or energy) consumed by a light bulb to achieve the required brightness.

Each type of light sources such as LED, fluorescent, halogen, or incandescent has a different lumen/watt ratio. Below we use lumens as a measurement to make sure the led lights have enough light for the space we want.

Choose Led lights according to Lumens


With these details on conversion lumens to watts, we hope they will be of help to you. In addition to the formulas and conversion lumens to watts outlined, you can also convert units easily through available computers on the website.

External Resources:

Kids Travel in Style with Stride Rite Shoes

Kids Travel in Style with Stride Rite Shoes

Summer vacation plans often involve a visit to a theme park with the kids. They love to run around from ride to ride and we want them to wear safe and comfortable shoes so why not add a bit of style. Stride Rite has been a long-time favorite of parents since these shoes are so well made, are really cute and last a really long time. The last thing we want is for cheap shoes to fall apart half-way through the day at the theme park (yes, this happened to me which prompted a visit to the park’s gift shop to buy some overpriced flip flops).

The fine folks at Stride Rite asked me if I would like a few complimentary pairs of the new Stride Rite for Disney Wish Light collection for my four-year-old to try. I told her that the new shoes would arrive in the mail and she told our various delivery people that she was waiting for hew new Disney princess shoes.

When the box arrived, she was so excited and she immediately slipped on her new Disney Wish Light shoes. She also said, “I can’t wait to show my friends.” And, she proudly showed everyone else and demonstrated the light up feature that resulted in a lot of “wows”!

If your little one can’t decide which Disney princess she likes the best, no problem. Stride Rite has Cinderella, Aurora, Rapunzel, Belle and Ariel. The heart-shaped princess gem lights up with every step.

If your kids are more of a Mickey or Minnie Mouse fan, check out the selection of Disney Baby Mickey or Minnie Mouse Soft Motion by Stride Rite.

With so many wonder choices at Stride Rite, your kids will definitely be traveling in style. Check out the Stride Rite website to shop for shoes for kids of all ages.

VetIQ – Your One-Stop Shop for Health & Wellness Products

VetIQ – Your One-Stop Shop for Health & Wellness Products

As a mommy of two darling girls, I love to spoil them with treats, but the family member that is most spoiled is our furry boy, Maximus, our big standard poodle. We are always on the lookout for products that will keep him happy and healthy and that’s where VetIQ comes in.

VetIQ has a great selection of quality medication and supplements for your pets at prices that you afford. We were sent a sample of VetIQ Minties, a mint-flavored dental bone that will help with bad breath, reduce plaque and tartar and help clean teeth. And, in our case, the Mintie bones kept Max occupied all afternoon as he enjoyed chewing and chewing. I didn’t tell him that it was good for him! VetIQ offers other great treats for your four-legged friends: Hip and Joint Chews, Vitamin Chews, Skin, and Coat Chews; Pill Treats, and Breath Chews.

VetIQ also sent Max a sample of VetGuardPlus for Dogs, a vet-recommended flea and tick protection formula. We have tried the other flea protection products and were anxious to put this product to the test. We carefully followed the directions and applied the VetGuard Plus and are very pleased with the results. The triple-action formula kills adult fleas and ticks and kills lice and mites for up to four weeks. It also kills flea eggs and larvae for up to four months.

Anyone who has ever had to deal with a flea problem knows just how persistent these little predators can be and how unhappy it makes your pet. We liked the prices available for flea protection products on VetIQ. If you have a cat, check out VetGuardPlus for Cats.

If your dog requires prescription medication, check out the medications on VetIQ for treating heartworm and inflammation.
Disclosure:  The opinions in this article are my own. I do not work for, or with, any brand mentioned in this article, nor do I have any official relationship with them.  I have a relationship with GigaSavvy, for whom I create original editorial content.

Be Skinny Launches in U.S. – Try This New Appetite Suppressant

Be Skinny Launches in U.S. – Try This New Appetite Suppressant

As swimsuit season approaches, I am on the lookout for ways to curb my ever-present appetite. I was intrigued by a new product Be Skinny which contains material saffron extract, an ingredient that Dr. Oz calls a “miracle appetite suppressant.”


I received a complimentary pack of two bottles of Be Skinny for the purpose of a review and I was curious to see if it really works — and how it would taste. The bottle is 2 ounces and has a fat-free pineapple cranberry flavor.

A bit about satiereal saffron: it is a 100% natural appetite suppressant. Rather than speed up your metabolism (and give you the jitters like so many other diet products), By Skinny addresses the psychology of snacking and has been clinically proven to decrease food intake in 100% of the subjects tested. It enhances the body’s release of the mood-enhancing chemical, serotonin. Studies also showed a 55% decrease in snacking and 80% of the trial subjects losing weight with the use of up to 176ml of saffron extract daily.

Before trying Be Skinny, I read the directions which stated to take one to two bottles a day at 45 minutes to one hour before meals. I decided to try to Be Skinny in the afternoon when I am most prone to snacking. I gave the bottle a good shake and drank it slowly to see how it tastes. The pineapple-cranberry flavor was tangy and yummy.  Sure enough, it worked! My cravings were dramatically diminished and I didn’t obsess about carb-filled snacks like I usually do.

Be Skinny saffron extract is available at Walgreen’s and other discount drug stores as well as the Be Skinny Juice website.