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Compare: Kelvin vs Lumens vs Watt

Views: 0     Author: Grace     Publish Time: 2022-07-08      Origin: https://www.suntechleds.com/

Table of contents

1.  What is Kelvin

2. What are Lumens

3. What about Watt

4. Lumens To Kelvin, is it possible?

5. Lumens To Watts, how to convert?

6. Conclusion



1. What is Kelvin

Kelvin is used for color temperature determination, usually in lighting, to express the color temperature of a light bulb or any other light source. In lighting applications, Kelvin temperature reflects the color temperature related to the physical temperature of an object, such as white, blue, warm, or bright red. You've probably seen a video where when a piece of metal is heated, it starts out red but gradually goes from orange, yellow, white to bluish white -- reflecting temperature, measured in degrees Kelvin.


The Kelvin temperature unit is represented by the symbol "K", and the higher the value, the whiter the light will be. The color temperature of household lamps is usually 2700K (warm incandescent), 3000K (warm white halogen) and 3500K (household fluorescent). Most interior lighting is on the 2700-3600K color scale, but if in an office or workplace, this will vary depending on the field of work, in which case it's 4000K and above. When choosing new lighting for your home or project, be sure to consider its color temperature to ensure the best results.


(1)Color Temperature Chart

Take a look at the chart below and use the Kelvin temperature color scale below to help determine the approximate hue some bulbs will provide.

Color Temperature chart

(2)Color Temperatures of Light Bulbs

In addition to the type of bulb itself, using the Kelvin temperature can help guide you in determining which light fixture is right for each room.


Whether you need ambient light or highly focused task lighting, keep in mind the following Kelvin ranges:

  • Less than 2000K: Emits a faint glow, similar to what you might find in candlelight; best for low-light areas where ambient lighting is welcome.

  • 2000K-3000K: Emits a soft white light, usually yellow in appearance; best for dining rooms, bedrooms, living rooms and creating romantic outdoor locations.

  • 3100K-4500K: Emits bright white light; best suited for places that require task lighting, such as kitchens, offices, workspaces and dressers.

  • 4600K-6500K: Emits bright blue-white light, similar to sunlight; best for display areas and work environments that require very bright lighting.

  • 6500K and above: Emits bright blue light, commonly found in commercial locations; best for bright task lighting.


2. What are Lumens

The lumens of a lamp is the total light output, that is, it is a measure of the brightness of the bulb. A higher lumen reading means the bulb will emit brighter light and vice versa. Since lumens tell you how bright a bulb is, you should check lumens instead of watts when buying a new bulb, and there's a difference between watts and lumens. As technology continues to advance and lamps become more energy efficient (especially LEDs), you will generally see the same equivalence lumens watts achieved with less led wattage than in previous years.


Since the brightness of the bulbs installed in your home can vary greatly, here compare lumens to watts and difference between lumens. So here are some general considerations to keep in mind when buying LED bulbs:

  • If you're looking to replace a 100-watt incandescent bulb, choose an LED bulb that's around 1600 lumens

  • If you're looking to replace a 75-watt incandescent bulb, you should look for an LED bulb with around 1100 lumens

  • If you're looking to replace a 60-watt incandescent bulb, you should look for an LED bulb that's around 800 lumens

  • If you're looking to replace a 40-watt incandescent bulb, you should look for an LED bulb that's around 450 lumens


The unit "lm/W" is a useful measure of a lighting product's efficacy by measuring the total light output in lumens divided by the power usage in watts. You can think of this as being analogous to miles per gallon in a car, as higher lm/W means higher efficiency and lower running costs compared to similar but less efficient models.


3. What about Watt

Watts are a measure of power consumption. For traditional incandescent lamps, generally the higher the wattage, the brighter the light will be. For energy-saving light bulbs such as LEDs at this stage, the situation is different, because there is no hard and fast rule to relate wattage and brightness. So when measuring the total output of a specific light bulb, you need to consider lumens, not watts.


Let's take an example of wattage -difference between light bulbs, A brand of 9-watt LED bulbs might give enough lumens to replace a 60-watt incandescent bulb, but another brand may need to use less efficient LEDs, say 12 watts worth of lumens to create enough lumens to replace a 60 watt light bulb. That's why, as we mentioned above, it's more important to look at lumens and watts.


4. Lumens To Kelvin, is it possible?

Conversion between Kelvins and Lumens is impossible. The two terms are not directly related. Therefore, it is impossible to deduce one value from another.

Above we described the concept of lumens and kelvins in detail. So the color of light is independent of the brightness of the light source. In principle, there are dark and bright kelvin led lights for every conceivable color temperature. Therefore, it is unreasonable or impossible to convert directly from kelvins to lumens or vice versa.


5. Lumens To Watts, how to convert?

Lumens To Watts

How to convert Luminous Flux in Lumens (lm) to Electrical Power in Watts (W)?

You can calculate wattage based on lumens and luminous efficiency. Lumens and watts units represent different quantities, so you cannot convert lumens (lm) to watts (w).


Lumens to Watts Calculation Formula:

The power P in watts (W) is equal to the luminous flux Φ V in lumens (lm) divided by the luminous efficiency η in lumens per watt (lm/W):

P (W) = Φ V (lm) / η (lm/W)

So watts = lumens / (lumens per watt)

or W = lm / (lm/W)


For example:

What is the power consumption of a lamp with a luminous flux of 1000 lumens and an efficacy of 20 lumens per watt (lm/W)?

P = 1000 lm / 20 lm/W = 50 W


Take a look at the table below showing a comparison of the power consumption and respective brightness of common light sources, such as 60 watts to lumens, 100W to lumens.

Lumens
Light bulb Halogen lamp Energy-saving lamp LED
230-270 lm 25w 19w 6w
2-3w
430-450 lm 40w 35w 9w 4-6w
730-800 lm 60w 50w 13w 7-9w
970-1100 lm 75w 64w 19w 8-11w
1380-1600 lm
100w 84w 23w 12-14w
1500-1800 lm 120w 98w 32w 15-17w
2000-2500 lm 150w 122w 40w 18-23w



6. Conclusion

Summary: Kelvin is a measure of the color temperature of light; lumens is a measure of the brightness of a light bulb; wattage is the power consumed by burning a light bulb. When we buy new LED bulbs, it depends on your own personal requirements. Where will the new light bulb be installed? What would you do with the light? The above content will help you better understand the difference between Kelvin, Lumens and Watts.


Related lighting knowledge that you may interest in:

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