What is lumens per watt?

Lumen or a unit of light power (Luminous Flux), is one of the most important standards of the lighting industry for various products. Lumen is the amount of visible light emitted from a light source such as a lamp and dispersed in the surrounding environment in one second. Lumen is abbreviated as lm and is used to measure the actual light emission of different light sources. In a simple definition, it can be said that lumen is the unit of measurement of the intensity and power of light source and shows the total light emitted from a light source every second. The more lumens a lamp has, the brighter it is. Knowing the right lumens will improve the quality of your lighting equipment.

What is lumens per watt?

The unit of measurement is at the international level, based on which the ratio of the amount of light flux produced per watt of consumed power is checked.

What is a watt?

Watt is the unit of power in the international standard system of units and is named after the Scottish inventor James Watt. One watt equals one joule of energy per second. In fact, watt represents the rate of energy consumption or production. Watt does not measure the amount of brightness, but calculates the amount of electricity (electrical energy) needed by a light source.

Watt does not determine the brightness of the lamp, but is a measure of the amount of electricity required by the lamp. Sometimes, a lamp may have a high wattage, but not a good light. The high wattage of a lamp means that this lamp needs more energy for lighting. There is a direct relationship between the number of lumens and the intensity of light, so the higher the number of lumens, the brighter the lamp. The efficiency of a lamp is also estimated by the ratio of lumens per watt (L/W). This number indicates the amount of lumens used per watt. To compare the brightness of two lamps, the number of lumens should be compared. The higher the number of lumens, the brighter the lamp.

What is the difference between lumens and watts?

Most of us, when we go to the store and look at the label and catalog of a light bulb, consider the wattage as the brightness because the wattage is an old and familiar unit of measurement to us. In case, with the advent of energy-efficient light sources and LED technology, the watt is no longer an authorized unit for measuring light.

Since these two units are not of the same family, there is no mathematical relationship that can convert watts to lumens or lumens to watts.

What is kandelas?

Another electrical unit that may be confused with lumens is the candelas. This unit is mostly used in America and is not well known internationally. However, it cannot be used instead of lumens. In fact, lumen means the amount of light emitted from a light source, but candelas measures the intensity of the source's glow. These two definitions may seem a bit confusing because they are similar but technically they are completely different and what should be considered when buying is the lumen of the lamp.

How to detect lumen:

Each lamp and lighting device that produces its own light has a characteristic table of information, which is called the product catalog, the lumen of each lighting device is included in the information section of the lighting device. Another way is to search for the lamp and lighting device that you are looking for on Google, and on the best websites that have the product in their store, you will be informed about the amount of luminous flux and lumens of the product in the product feature section. Also, all the features of the products are registered on the site of Noorfan Spadana Engineering Company.