Let’s calculate how much energy your LED absorbs compared to old incandescent lights.
I remember the Christmas tree as a kid. It has such a large colored bulb-it’s beautiful, but you can’t touch them. Yes, these are old-style incandescent lights that can easily get hot. Essentially, they are smaller versions of the bulb to be placed in the bulb.
Today, many people still use an incandescent light as a Christmas light. They are smaller but more efficient and do not get hot. But now we have another lighting option, light emitting diode or LED. LEDs differ from incandescent lights in that they do not use a higher filament temperature to emit light. In contrast, when electrons make energy transitions inside the device, a diode emits light.
Are LED lights better than incandescent lights? Let’s look at three comparisons between LEDs and incandescent lights.
1. Which uses more power?
Energy is not free. In the United States, the average electricity price is 13.3 cents per kilowatt-hour. But be careful not to confuse energy with energy. When you pay for electricity, you are paying for energy. Power is a measure of how quickly you use energy. Can be calculated as:
If you use energy in joules and time in seconds, you get power in watts. But what about kilowatt-hour units? That’s what you get with 1,000 watts for 1 hour (or 3,600 seconds). Using the power equation above, I can find the power times the energy of time. At 1,000 watts for 3,600 seconds, it is 3.6 million joules.
Now used for power measurement. I will use some type of power meter, the basic idea is to plug in some devices and report the power they consume. Here are two sets of lights that I want to test with the LED on the left.
OK, there are two differences between these lights (except LED and incandescent). The cables for one group of lights are white and the other is green, but of course it doesn’t matter. However, incandescent lights are a string of 100 lights, while LEDs are only 50. So, I can’t just compare the power of these two lights. Instead, I will get the power of each light.
For incandescent lights, the power of each light is 20.0 watts or 0.2 watts. LED wiring harness is 2.4 watts or 0.048 watts per light. Obviously, incandescent lights use more power. But is this enough to make a difference in your wallet?
Suppose you have a Christmas tree with 500 lights on it (maybe even more if you live in my house). If these lights are operated for 5 hours at 13.3 cents per kWh, the cost of LED lights is 1.6 cents and the cost of incandescent lights is 6.6 cents. So this is not bad for a tree.
Just for fun, this is a beautiful image that shows why LEDs use less power. This is an infrared image, so you can see which set of lights are getting hot.
Please note that the indicator light (LED) on the right is much cooler. Actually, there is a hot spot here-I’m not sure what it is, but it’s not an LED bulb.
2. Which is brighter?
Well, LEDs use less power. But are they as bright as incandescent lights? You can make a visual comparison, but I want to take it to the next level. You can use a photocell to measure the brightness of the light, but I will use this light sensor, which can record changes in intensity over time. I also include a rotation sensor so I can measure the light intensity from each light at different angles. This is my setup.
The idea is to rotate the light so that the sensor gets data from both the top and sides of the bulb. This is the output of an incandescent light bulb.
Note that for this bulb, its sides are actually brighter than the top (0 radians is the top of the bulb). You may be able to calculate the total light output, but you have to do some math.
3. Change the LED light now.
LEDs are brighter in some ways. On top of the LED, it exceeds 70 lux, with incandescent peaks of about 15 lux. After moving away from the top of the LED, you will get very little light. But wait! There is another very important difference. The LED only lights up for some time. This is because LED lights are not always on. In fact, the LED lights are turned on and off. This is a graph of the changes in brightness of two lights over time in 0.1 time intervals.
Within this time frame, you can clearly see that the LED indicator (blue curve) turns off and then back on. This is because the "D" in the LED is the diode. Diodes only allow current to pass through light in one direction, but electrical outlets produce alternating current (AC). Of course, you can solve this problem by putting the AC to DC converter into the light string, but this will increase the cost of the light and the power used.
Ninghai Haohua Company is a professional Chinese manufacturer and supplier of LED Holiday Light . We have our own quality inspection system and testing equipment to ensure product quality. Click on our website to see more LED holiday light product information, welcome to buy and consult: https://www.nhhx.net/
I remember the Christmas tree as a kid. It has such a large colored bulb-it’s beautiful, but you can’t touch them. Yes, these are old-style incandescent lights that can easily get hot. Essentially, they are smaller versions of the bulb to be placed in the bulb.
Today, many people still use an incandescent light as a Christmas light. They are smaller but more efficient and do not get hot. But now we have another lighting option, light emitting diode or LED. LEDs differ from incandescent lights in that they do not use a higher filament temperature to emit light. In contrast, when electrons make energy transitions inside the device, a diode emits light.
Are LED lights better than incandescent lights? Let’s look at three comparisons between LEDs and incandescent lights.
1. Which uses more power?
Energy is not free. In the United States, the average electricity price is 13.3 cents per kilowatt-hour. But be careful not to confuse energy with energy. When you pay for electricity, you are paying for energy. Power is a measure of how quickly you use energy. Can be calculated as:
If you use energy in joules and time in seconds, you get power in watts. But what about kilowatt-hour units? That’s what you get with 1,000 watts for 1 hour (or 3,600 seconds). Using the power equation above, I can find the power times the energy of time. At 1,000 watts for 3,600 seconds, it is 3.6 million joules.
Now used for power measurement. I will use some type of power meter, the basic idea is to plug in some devices and report the power they consume. Here are two sets of lights that I want to test with the LED on the left.
OK, there are two differences between these lights (except LED and incandescent). The cables for one group of lights are white and the other is green, but of course it doesn’t matter. However, incandescent lights are a string of 100 lights, while LEDs are only 50. So, I can’t just compare the power of these two lights. Instead, I will get the power of each light.
For incandescent lights, the power of each light is 20.0 watts or 0.2 watts. LED wiring harness is 2.4 watts or 0.048 watts per light. Obviously, incandescent lights use more power. But is this enough to make a difference in your wallet?
Suppose you have a Christmas tree with 500 lights on it (maybe even more if you live in my house). If these lights are operated for 5 hours at 13.3 cents per kWh, the cost of LED lights is 1.6 cents and the cost of incandescent lights is 6.6 cents. So this is not bad for a tree.
Just for fun, this is a beautiful image that shows why LEDs use less power. This is an infrared image, so you can see which set of lights are getting hot.
Please note that the indicator light (LED) on the right is much cooler. Actually, there is a hot spot here-I’m not sure what it is, but it’s not an LED bulb.
2. Which is brighter?
Well, LEDs use less power. But are they as bright as incandescent lights? You can make a visual comparison, but I want to take it to the next level. You can use a photocell to measure the brightness of the light, but I will use this light sensor, which can record changes in intensity over time. I also include a rotation sensor so I can measure the light intensity from each light at different angles. This is my setup.
The idea is to rotate the light so that the sensor gets data from both the top and sides of the bulb. This is the output of an incandescent light bulb.
Note that for this bulb, its sides are actually brighter than the top (0 radians is the top of the bulb). You may be able to calculate the total light output, but you have to do some math.
3. Change the LED light now.
LEDs are brighter in some ways. On top of the LED, it exceeds 70 lux, with incandescent peaks of about 15 lux. After moving away from the top of the LED, you will get very little light. But wait! There is another very important difference. The LED only lights up for some time. This is because LED lights are not always on. In fact, the LED lights are turned on and off. This is a graph of the changes in brightness of two lights over time in 0.1 time intervals.
Within this time frame, you can clearly see that the LED indicator (blue curve) turns off and then back on. This is because the "D" in the LED is the diode. Diodes only allow current to pass through light in one direction, but electrical outlets produce alternating current (AC). Of course, you can solve this problem by putting the AC to DC converter into the light string, but this will increase the cost of the light and the power used.
Ninghai Haohua Company is a professional Chinese manufacturer and supplier of LED Holiday Light . We have our own quality inspection system and testing equipment to ensure product quality. Click on our website to see more LED holiday light product information, welcome to buy and consult: https://www.nhhx.net/
コメント