What is luminous flux (LUMEN)? Led luminous flux formula

The current types of LED lighting now have different specifications, so when buying LEDs, you need to grasp the basic knowledge of these parameters to buy accordingly.

When buying a LED in general or solar LEDs in particular, you will see the parameters on the product, some common and important parameters of LEDs are Lumen, also known as optical. information. This is a factor when buying a lamp, you need to pay attention to make a decision to choose a suitable LED lamp for your living space.

So to help you understand more about this indicator, in this article Givasolar will share related information: what is luminous flux? Find out about the luminous flux of the LEDs, the calculation formula as well as the appropriate selection.

1. What is luminous flux?

Definition: Luminous flux (lumen symbol) is a photometric quantity that tells you the radiant power of a light beam emitted by a point light source. Or more understandably, it is the total amount of light emitted by a light source.

  • Unit of luminous flux (in SI, CGS units): lumen
  • Symbol of luminous flux: lm

Because the luminous flux indicates the brightness level of the light source when buying LEDs you should pay attention to the luminous flux index. If you want high brightness, choose LEDs with large luminous flux and vice versa. Or if you choose a lamp with a small luminous flux, more lights will be needed to light it up.

Refer: Top 10 best floor lamp patterns for dark rooms 2021

2. The luminous flux of LEDs:

The luminous flux of the emitted LEDs is measured in lumens (lm). If you want intense lighting, choose lamps with a high lumen index. If you want to save energy or use lamps with a low lumen output, at least have enough illumination.

LEDs today are quite diverse. For example, ceiling recessed led lights to have common luminous flux at 600 – 1600Lm, luminous flux LEDs from 700-2000 Lm … Based on the luminous flux index on the lamp, the designer and construction of the light are easy to calculate the position of the lamp, the distance of the lamp, the appropriate number to ensure adequate light supply.

3. Why do you need to pay attention to the luminous flux index of the LEDs:

In the past, when using traditional lighting equipment such as incandescent and fluorescent lamps, people often paid attention to wattage (W) and assumed that a lamp with a large wattage was associated with a higher level of illumination. This is really not true for some other lamps such as chandeliers, wall lamps, table lamps, ceiling lamps or floor lamps, … using current LED technology. In fact, the amount of light emitted from a bulb is measured in lumens of luminous flux, not watts of power.

Lumens let you know how much light you need. So when buying LED bulbs, you need to care about lumens, not watts

With the outstanding advantages of lighting, it does not consume too much power and heat, and LEDs are extremely durable and have a long life, limiting costs in repairing and replacing bulbs. LED lights such as LED ceiling lights, led spotlights, led strip lights, table lamps, led wall lights, … are commonly used in home interior and exterior design. And most of all, solar-led light is the most optimal outdoor lighting device.

Refer: Reveal for you some product Growing Plants with a Desk Lamp

How to convert watts to lumens?

Watt Incandescent
Halogenlumen CFLlumen LEDlumen
15W 90 120 125 135
25W 220 215 230 250
40W 415 410 430 470
60W 710 700 740 800
75W 935 920 970 1055
100W 1340 1320 1400 1520
150W 2160 2140 2250 2450

4. How to choose the lighting efficiency of LEDs with the luminous flux of LEDs?

Not just reference numbers. It also depends on a number of factors such as: the shape and size of the room, ceiling height, type of lamp, lighting area, color scheme, and user needs. Refer:

  • The kitchen and bedroom area has LED luminous flux from 300 – 400 lumens
  • The living room area has a lumen output of 400-500 lumens bathroom area with a lumen output of 500 – 600 lumens
  • The reading area has a luminous flux of 400 lumens
  • The area in the hallway had a luminous flux of 300 lumens
  • You should choose LEDs with lighting efficiency from 70 lumens / W – 90 lumens / W, with a luminous flux level of LEDs suitable for the lighting space in offices and houses.
  • For larger spaces such as stadiums, sports grounds, workshops, choose lighting efficiency from 100 lumens / W – 110 lumens / W.
  • For garden lights used as accent lighting, 50 lumens are usually sufficient for color and lighting in your yard.



How a baby swing help to express a mother’s love?

How a baby swing help to express a mother's love? 3

New year’s eve is around the corner. Usually, this would be a time when everyone gathers around their elders and listens to their glorious youth. However, it’s early 2021, the stench of 2020 is still lingle around here. I wonder how long I have to miss an overly crowded house. Such a lovely Asian tradition.

How a baby swing help to express a mother's love?

Anyway, it’s just me, my mom, and a couple of dozens of relatives this time. As the night falls down gently, our solar lights begin to shape the walkway in the front yard. My mom elegantly picks up the mic. She forms an L shape with her thumb and pointy, then places it touching her upper lip. Slowly, her eyes glance left and right as if they are making sure that people get the feeling of looking down to an abyss. After a good minute of peace before the storm, the beat is dropped mercilessly:

“Yo lads, do you even see how life used to be? I brought to the world 6 babies and got them all through the university, by my OWN currency, (hitching her head toward grandpa) please, tell me I’m your best baby”

“Daaaaaaamn”, everyone just can’t stop themselves from stomping the floor or finding something to tap their hands on. Among the sound of glory, my mom is crossing her arms and pushing her lower lip out at its maximum capacity. Yeah, if you are not familiar with Asian culture, a big gathering time is the time for showing off their achievements. The funny thing is they repeat the same thing over and over again, but they still can surprise you with the new delivery method each year.

Because of the noise, my sister’s newborn baby is wakened up and starting to channel her favorite chant. I hear someone says “aw shoe, it’s gonna be a pain in the a to soothe her now”. Well, to drops their jaws, my sister proceeds to place the baby in her baby swing which soothes her baby in a matter of seconds. What a tool. You might want to read my tips on how to use a baby swing to calm an infant.

How a baby swing help to express a mother's love? 2

The night is still young, and it gets even wilder since we don’t have to worry about the noise level. My mom spends the rest of her night wondering if this kind of technology existed back in her time. “It could’ve saved you quite a few crinkles by now” someone barks. We all laugh in agreement.

There is plenty of ways for a mother to express her love towards her child, but surely it would not hurt to share some of her burdens over to the modern baby’s products. At least, the soothing and lulling the baby now is definitely a world different from 20 years ago. It also has a huge impact on the way a mother raises her child. It’s more like, less hustle, then she can save and transfer all that energy into love, more love.

Alright, to conclude today’s story on a high note, Happy New year everyone. May 2021 the best year ever.

Further reading:    Choose a bayby swing

Why table tennis is the best sport in the world

Table tennis is the popular sport in the world

Why is table tennis? There are thousands of other sports out there, but table tennis has been one of the best liked and most loved sport by many athletes and sports lovers in the world. It relatively known as the most rapid competitive sport around the globe, as well as being one of the simplest ones to learn and play. What makes table tennis great for the brain is that it is a very challenging sport, in terms of thinking and problem solving, which will give you and your brain hours of enjoyable and stress-relief.

9 reasons why is table tennis a popular sport

1) Good for your brain

ping pong is good for your brain

Table tennis is a challenging sport for several reasons. For example, it requires a great deal of mental acuity. The game involves a lot of decision making and problem solving skills, both on and off the court. This type of thinking and problem solving is good for the brain, which will be the mechanism that helps your brain to process quickly and efficiently when it comes to making decisions. All of these great things are the reason why table tennis is the perfect sport to learn and play, for anyone from any age group and in any walk of life.

2) Suitable for all ages

In addition to the great things about table tennis, the game itself is great for any age group. You can play table tennis even if you are still a child, and there are even some kids’ versions that you can buy nowadays. At any age, you can dive in and have some fun, even if you are old. That is because the sport itself does not discriminate based on age or gender.

3) Less expensive

The best reason to learn and play table tennis is the money. It’s a very inexpensive sport, especially when you consider all of the equipment you need (or you don’t need). A good set consists of: a racket, four ping-pong balls, a net and a portable table – thanks to sportypong’s review of the cheapest ping-pong tables. Now, add up the cost of those things over an entire season of play and you may come up short.

4) Perfect exercise

What is the one thing you will benefit the most from playing? Of course, the obvious: the game itself. Because it utilizes all of your body metabolism, you are constantly working out your muscles. This is a great benefit and one you will notice right away. If you are someone who can’t stand long workouts, then table tennis can be a great choice for you.

5) Good for cardiovascular

It is also a great cardiovascular workout. Table tennis requires a great deal of jumping and spinning, as well as a great deal of running and moving around. All of that running and moving around gets your heart pumping, which can be great for your heart. And, since it is a stationary sport, there is absolutely nothing that can go wrong.

6) Play anywhere, even play alone

practice table tennis alone

If you don’t have access to a table tennis robot, don’t worry. You can still play this great sport. You just won’t have to use a machine. Because you play the sport where there is no contact, it is extremely safe to play anywhere, even play alone.

7) The mental game

One last reason to play the great table tennis sport, and one that is often overlooked. The mental game. The better you get at this, the better you will do in any competition. That includes life. By taking the time to think correctly, you can do things with your body that is almost impossible in many sports. Playing table tennis helps your brain work, which is something that is extremely important and useful.

8) Low club fees

It is impossible to talk about these reasons why table tennis is the best sport without talking about money. The cost of joining a club and consistently using your racket for hours at a time can quickly add up. If you don’t have the money to join a club, don’t worry. You can also buy your own paddle, ball and other accessories. Not only is it cheaper than buying them from someone else, but you can find discount prices if you shop around online.

9) Finally, let’s discuss winning

You cannot measure this aspect of the sport in dollars and cents. You have to put into consideration the fact that you are constantly getting points. These points add up quickly and overtime is even more of an all-timer. Therefore, you want to rack up those points because your chances of winning are very good. This means playing as often as possible, especially when you are a good player.

There are many reasons why table tennis is the best sport to play. However, you need to be honest with yourself and know why you play. Once you are able to pinpoint why you play, then you can choose how you are going to play. Maybe you are a great blocker, so now you can play that position. Maybe you are a great rebounder, so now you can play that position too.

More info:

What sport is table tennis most related to?

The ultimate guide to ping pong table dimensions


DeMairni CF Review

2020 DeMairni CF Review

2020 baseball bat market has one of its greatest contribution from DeMairni CF baseball bats, a high-end multi-peace composite bat. It won the ‘youth bat of the year’ prize in Bat Digest’s the best baseball bats award with flying color scores. For years, DeMarini’s CF has defined the USSSA space, while other bats in the same category has been trying their best to catch up, the gap is still considerable. Here is the 2020 DeMairni CF review, as a suggestion for player whether they decide to buy this bat or not.

The content of the article using assessment from: Baseballtrack.com

As you have noticed, the USA baseball market is massively competitive, for the last few years there are only a few bats could survive and rise to the top of the chart. For 2020, Demarini CF got itself lots of compliments for its feel, balance and vibration in the USA. As well, its demand went off the charts – easily ranking in the top5 of USA bats by popularity. Demarini CF is considers as one of the lightest swing baseball bat on the market, which create its huge difference comparing to other opponents.

DeMairni CF

DeMairni CF is basically graded perfectly in every perspective by many hitters. They love the swing weight, the ball feeling, the bats big barrel and performance on balls you square and even miss. The CF line is more popular than all of other bat brand combined. The drop 10 is the perfect combination of balance and power, the drop 8 is a dreamy and 10 is legendary. It is a relevant choice for 100% of serious USSSA players, a bat which parents will definitely not regret to buy for their child.

In the BBCOR test, the CF shines brightly in from its user feedback. Players love the way its feels, sound and how their hands respond to hit and mishits. The 3-Fusion technology used in the construction diffuses vibrations and generates energy back into the barrel for better performance. Also, the Paraflex Plus composite materials are back for another season and likely will provide premium feel and pop. Another advantage is that the CF contains various size options to fit the vast majority of serious baseball players. Although the BBCOR market is replete with options, the 2020 DeMarini CF has ranked among the top 8 BBCOR bats everywhere we looked.

However, there are two critical drawbacks to the 2020 DeMarini CF fastpitch bat.

Undoubtedly, the first point is it expensive price. Its price tag won’t be kind to your wallet. If your price limit is not upper 350$ but you still want a DeMarini one, we suggest you to buy the last year model, or a used one. Secondly, Demarni CF is a composited bat, so that it lack durability. It will require a break-in period (150 hits approximately) before reaching maximum performance.

Read more:

Is MMA useful when fighting?


First of all, what is MMA? MMA stands for mixed martial arts, which means that MMA is not a separate martial art but a combination of many different martial arts. MMA users will have to learn a lot of martial arts so when playing MMA is not limited in terms of skills, moves.
MMA is known as a martial art with high practicality and resistance, promoting speed and power. In MMA, there are three main types of fighting: boxing, wrestling, and punching. With the charge, the user will be flexible in moving, dodging attacks and launching dangerous attacks but it will be difficult to unleash when closed or objects. Meanwhile, wrestling and hitting the floor priority groups lock, tighten the parts on the body. This type of attack can disable quite a lot of right attacks.

The above shows that MMA is very useful in real combat. MMA is a combat sport so in real combat, we can use MMA to defend in case of need. Fighting in MMA or real battle is all about winning. MMA fighters are trained in appropriate skills for battles. Especially when dealing with enemies who just want to kill you, MMA is even more useful because MMA is very violent. The combined attacks of many martial arts can save our lives in an emergency.
However, it should be noted that street fights are also very different from those on the ring. After all, MMA is just a fighting sport and many real-life situations may not be the same as fighting in an octagon cage. We sometimes face armed enemies or enemies in large numbers. MMA is also just a sport as it is bound by many different fighting principles. Many MMA attacks in real battle endanger the user. In order to use MMA to be useful in real combat, sometimes we have to throw away the rules and accept to fight for the survival and ready to fight that seriously wound the opponent.

Read more:

How to choose the best speed punch bag?

The criteria when buying punching bags?


Tips on How to Throw a Baseball Harder & More Accurately

Baseball Pitcher

In baseball, there are many different techniques and movements. A dangerous pitch is an attack that cannot be prevented by the opponent, giving your team an advantage. Let me learn how to effectively pitch.

Maybe you need: https://www.baseballtrack.com/best-youth-baseball-bats/

A basic way of throwing a baseball.

The pitcher is one of the most frequently used positions for this technique. Their mission is to make the batter unable to hit the ball.

So to become a pitcher you have to master this move. Must calculate to make it difficult to batter, but still coordinate to catcher can catch the ball easily. From there to score points for your team.

Throw baseball is a technique that requires players to practice many times. Not just throwing a ball, it also includes many elements: throwing force, pitch angle, the timing of balloons, …

Types of baseball throw.

Playing baseball from beginner to professional, all have the same way of pitching. The strategy of the ball determines the throw method of that ball. Players need to first discuss or signal with the catcher, to coordinate the best.

Each type of pitching has a different way of holding the ball, like very slight changes in the fingers. But they are extremely important to know what the pitcher is going to do.

Fastball: type throw ball shifts speed in a straight trajectory.

Off speed: throwing the ball at a slower speed than a fastball. It can fly with many different trajectories.

Breaking ball: Throwing a ball causing the ball to change its trajectory when flying.

Curveball: throw the ball to spin.

Slider: almost like a curveball but the ball goes lower.

Slurve: ball swirling and can change flight trajectory.

Forkball: the ball gently shakes so the opponent cannot guess the ball path.

Change up: ball slowly and fly in 1 orbit.

Circle change-up: the ball goes slowly but can change the trajectory.

4-seam fastball: the ball goes straight and has extremely high speed.

2-seam fastball: the ball is straight and fast, with a cut from left to right.

Sinker: the ball flies straight and fast, tends to go down.

Cutter: like fastball and cut from right to left.

Splitter (split-finger fastball): the ball drops suddenly when approaching the batter. One of the throwing balls that surprised the opponent.

Knuckleball: the ball is slow, does not follow any trajectory and has no spin, so it is difficult to prevent.

Eephus: the ball has an arc-shaped trajectory with extremely slow flying speed.

man throwing baseball

Read more: Louisville Slugger Solo 619 Review

How to throw the ball swirl.

It is difficult to practice accurate pitches. But it’s harder to throw the ball back and forth. A pitcher needs to use a lot of force. The ball must be very strong and at the same time curved angle to create a vortex and change the trajectory. To be so, players need to practice a lot. Just increasing the strength of the supple hands creates ball throwing reflexes.

Above are the types of baseball throws. Wish you success and have great matches.

Read more: Baseball Throwing Drills

What kind of punching bag is right for you?

Welcome to our Blog. Where we share our knowledge of martial arts and self-defense, we offer the best products, suitable for each person’s level.
Our recent article discusses the difference and similarity between standard BOB punch bags and Century BOB XL punching bags. The article has received a lot of feedback, good reviews from users.
Today, we share with you an article on the topic of the best humanoid punching bags in 2019, which is appreciated by many users for quality, durability, usefulness …
See more:
Best punching bags in 2020
BOB standard vs BOB XL

1. Celebrita MMA Grappling Dummy

The punching bag is shaped like a kneeling body, arms stretched out straight. This punching bag has the same body length as the real body. Help people practice kicking or punching directly into the face, hands, stomach, ribs of the punching bag. A punching bag is made of soft leather, the surface has small holes. There are two types of Celebrita MMA Grappling Dummy punch bags: A type for children with a height of 40 inches and a weight of 25 kg to 35 kg. Adult type with a height of 70 inches and weigh up to 55 kg.
2. Century BOB XL

Punch bags of the famous Century. This is an upgrade of the standard BOB version, for those who have the power, practice with high intensity. This punching bag weighs over 122 kg and the maximum height is 72 inches. Consists of 2 parts: a circular base unit, made of hard plastic, filled with sand and water inside. Help stand firm, sure. Human body parts, made of soft plastic material, rough surface, fierce face, full of parts such as face, neck, shoulders, chest …

3. Century VS.2 Versys Grappling Simulator

Free-standing punching pouch, almost like a mannequin, but without ahead. Unique design, two legs and arms outstretched and a third leg behind to help keep the balance for this punching bag. The weight put down below makes this punching bag more stable and won’t move when you exercise.

4. MMA Man Shaped Dummy

This body-shaped punching bag weighs about 34 kg, height about 173 cm – equivalent to the height of an adult. This punching bag is designed to hang on the ceiling, so it will not take up space and help the practitioner easily punch or kick any part of the body of the punching bag.
5. Aqua Bruiser punching dummy bag

Designed with soft leather material, the inside is filled with water and air, helping the practitioner feel comfortable and comfortable when punching or kicking this punching bag. This punching bag is designed to hang easily from the ceiling to the ceiling, does not damage the floor or is stored away after training. Design the shape on behalf of the human body, including the head and body. Height about 185 cm.
Above are somebody shape punching bags that users appreciate during practice. You can consult to choose the product that suits your martial arts and qualifications.
Read more:
A 20-Minute Punching Bag Workout