Home Lighting: LED Lights Save Energy And Cost-effective

- Aug 13, 2019-

Recently, Mr. Liu went to the supermarket to buy a light bulb, but the light bulbs on the shelves were dazzling, which made him pick the eyes. "In addition to the traditional incandescent and energy-saving lamps, there is also an LED light. I don't know how the lighting effect of this kind of lamp is?" Which incandescent lamp, energy-saving lamp, LED lamp is cost-effective? Through experiments, it is found that home lighting or LED lights are cost-effective. .


■LED lights are 16 times more expensive than incandescent lamps

At present, incandescent lamps are facing a situation of being gradually eliminated, and energy-saving lamps have become the mainstream in the market. The reporter saw in a large supermarket that energy-saving lamps have become the main products, and the emerging LED lights are not difficult to buy, and incandescent lamps are hard to find. In terms of appearance, unlike the shape of the lamp of the energy-saving lamp, the LED lamp is also a spherical bulb, similar to an incandescent lamp. However, the labeling of the outer packaging shows that the power of the LED lamp is much lower than that of an ordinary incandescent lamp.

"The light bulb in your hand is 5 watts of power, and the illumination is equivalent to 40 watts of incandescent light." The supermarket shopping guide told reporters that the brightness of the selection of LED lights and energy-saving lamps is mainly based on the markings on the box that correspond to incandescent lamps. The wattage. The reporter also noticed another 3 watt LED lamp with a brightness equivalent to a 25 watt incandescent lamp.

The shopping guide told reporters that many people still choose incandescent or energy-saving lamps, and there are not many customers who buy LED bulbs. "LED lights are too expensive." The reporter noticed that the price of a brand of 5 watt LED lights is 49.8 yuan, which is 16 times more expensive than other energy-saving lamps or incandescent lamps. However, it is understood that this LED lamp can be marked for 15 years.

■ incandescent lamps consume the most electricity

So, what are the actual effects of these common light bulbs on the market? Here are three comparative experiments on common bulbs on the market.

The three bulbs are incandescent, energy-saving and LED, and the price ranges from 3 yuan to 49.8 yuan. The incandescent lamp has a rated power of 40 watts, and the energy-saving lamp has a rated power of 8 watts, which is nominally equivalent to the brightness of a 40-watt incandescent lamp, while the LED lamp has a rated power of 5 watts and its nominal brightness is equivalent to 40 watts. Incandescent lamp.

During the experiment, in a dark room, the three bulbs were respectively connected to a 220-volt lamp holder, and the current was measured with an ammeter to measure the actual power of the bulb. At the same time, the box of three bulbs was placed at a distance of 30 cm from the bulb, and the camera was used to capture the reflection of the box with a fixed exposure to visually sense the difference between the three bulbs.

By testing the current, the actual power of the three bulbs is quickly derived. The incandescent lamp current is about 0.18 amps, the measured power is about 40 watts; the energy-saving lamp current is about 0.035 amps, the measured power is about 7.7 watts; the LED lamp is about 0.021 amps, and the measured power is about 4.6 watts. From these data, incandescent lamps have the highest measured power and are the most power-hungry.

■The LED light is the brightest and the most "cold"

So, what is the actual lighting effect of the three bulbs? Take a group of photos with the same exposure combination and record the reflection of the box under different bulbs. The photo shows that the LED bulb has a nominal power of only 5 watts. But the highest. The incandescent lamp has a slightly lower brightness, and the radiant yellow light looks very bright, but it feels relatively soft. The shape of the lamp of the energy-saving lamp is a shape of a shape, and the light-emitting area is larger, but the color is white, and it is slightly glaring when looking directly.

The same is 40 watts or 40 watts, why is the lighting effect different? This is because the light of incandescent and energy-saving lamps are diverging around, and the light of LED lights is emitted in a single direction, so it looks better than The other two bulbs are brighter.

In terms of heat dissipation, the incandescent bulb can not be touched by hand because of the high temperature after 2 minutes of use. The energy-saving lamp is obviously hot, but the tube is not very hot when it is held by the hand, and the LED bulb is minimal. The light bulb is close to the lamp socket and can be felt slightly warm when touched by hand.

■LED lamp is the most cost-effective

From the point of view of the price, buying an LED lamp is equivalent to purchasing 16 incandescent lamps. Buying an energy-saving lamp is equivalent to spending 9 incandescent lamps. Buying LED lights is obviously not as cost-effective as energy-saving lamps and incandescent lamps. However, taking into account factors such as power consumption and lamp life, the LED lamp lighting life is 15,000 hours, which is equivalent to 15 incandescent lamps or 3 energy-saving lamps. In terms of power consumption, incandescent lamps need to consume 600 kWh, energy-saving lamps are 115.5 degrees, and LED lamps are only 69 degrees.

Calculated according to 0.48 yuan per kilowatt hour, using 15,000 hours, the electricity cost generated by using incandescent lamps is 333 yuan, the energy-saving lamps are 139.44 yuan, and the LED lights are only 82.92 yuan. If used for a long time, it is still the most cost-effective LED light, and the lighting effect is the best.

Energy-saving lamps save power and worry?

Living room chandeliers, desk lamps, bedside lamps... At present, energy-saving lamps have generally entered the family and are welcomed by consumers. However, the controversy over energy-saving lamps has been constant, and the arguments of "radiation-induced carcinogenesis" and "spectral discontinuity in the eye" have caused much controversy.

The energy-saving lamp is actually a compact fluorescent lamp with its own ballast. After being energized, the mercury atoms in the tube emit ultraviolet light that is invisible to the human eye. The ultraviolet light hits the phosphor coating on the inner wall of the lamp and is then converted into visible light. However, it is this invisible and intangible ultraviolet light that makes the energy-saving lamp buckled with a "radiation lamp".

It is understood that energy-saving lamps do release a small amount of ultraviolet light, but in fact all lights will be like this. The amount of ultraviolet light emitted by energy-saving lamps is very low, within the limits that people can afford. For the public, there are many measures to deal with the radiation of energy-saving lamps. The most direct way is to purchase low-energy energy-saving lamps. The second method is to check the test report of the product before purchasing the energy-saving lamp, and purchase it according to the standard that “the electric field strength should not exceed 200 volts/meter and the magnetic field strength should be lower than 10 microtesla”.

When the light wave is transmitted, it will decrease with the distance and away from the energy-saving lamp, which can further reduce the chance of being hurt. Therefore, to be safe, it is best to keep the energy-saving lamp at a certain distance from the human body. Generally speaking, it is safe to keep a distance of 1 meter from the energy-saving lamp. It is best not to use energy-saving lamps in places close to the head, such as reading lights on the bedside.

A more important issue with energy-saving lamps is the recycling of used lamps, because the mercury in the tubes is very polluting to the environment, and mercury is a toxic substance. A single inhalation of more than 2.5 grams can cause death. When using energy-saving lamps, the public must prevent damage. The discarded lamps should be marked with a reminder to avoid harm to others.

Banned ≥60 watt general lighting incandescent lamp from October

In the beginning of 2014, “disabled incandescent lamps” were listed on the delisting agenda in all countries. Since January 1, the US market has stopped selling the best-selling 40-watt and 60-watt incandescent lamps. South Korea, Thailand, and the Philippines have also taken measures to promote energy-saving lamps. Starting from October 1 this year, China will also ban the import and sale of ordinary lighting incandescent lamps of 60 watts and above. According to industry analysts, the LED lighting market has suddenly become "bright", and the replacement of light sources will be launched globally in 2014.

The reporter learned that in fact, in 2011, China had an incandescent lamp elimination plan. According to the incandescent lamp elimination plan, after the transition period, ordinary lighting incandescent lamps of 100 watts or more have been banned from import on October 1, 2012. Sales. This year will enter the third stage. From October 1, 2014, it is forbidden to import and sell ordinary lighting incandescent lamps of 60 watts or more. The period from October 1, 2015 to September 30, 2016 is the mid-term evaluation period; from October 1, 2016, the import and sale of general-purpose incandescent lamps of 15 watts or more are prohibited, or adjustments are made based on the results of the mid-term evaluation.

According to experts from the Lighting Society, incandescent lamps generate heat through tungsten filaments. When used, only 5% of the energy is used for illumination, and the remaining 95% is consumed by heat. Energy-saving lamps can convert 80% of electrical energy into light energy, and LED lights can directly convert electricity into light with lower power consumption. “After the light source is replaced, energy-saving lamps and LED lights will occupy the lighting market.”