LED lights and energy-saving lamps are equally cost-effective. Experts recommend LED lights

According to reports, incandescent lamps are currently being phased out, and energy-saving lamps and LED lamps have become the mainstream in the market. However, because the unit price of incandescent lamps is relatively cheap, some citizens still think that using incandescent lamps is more cost-effective. Some people think that energy-saving lamps are cost-effective, while others think that LED lights are cost-effective. So which one is the most cost-effective among incandescent lamps, energy-saving lamps and LED lamps? Our laboratory will tell you the answer through experiments.

Survey: Supporters of energy-saving lamps and LED lamps are almost the same

Before the experiment began, the reporter conducted a survey to see which incandescent lamp, energy-saving lamp, or LED lamp was the most cost-effective in the eyes of the people. Citizen Grandma Li said, I still use incandescent lamps because they are cheap. Ms. He said, "I think LED lights are definitely better in terms of effect and brightness, but in terms of power saving, I think they are not much different from LED lights, but the unit price of LED lights is more expensive, so overall consideration may be that energy-saving lamps will be better."

Mr. Zhang said, "It must be LED lights. LED lights are the trend now. The ones installed in my home are LED lights. When the merchants promote them, they also say that they are more energy-saving and brighter. I feel good after using them, so I think this one should be the most cost-effective."

After some interviews, I found that supporters of energy-saving lamps and LED lamps are almost the same. So is it what the citizens think? The answer can only be found from experimental results.

Experimental article: LED lamps are superior in brightness and power saving

Experimental tools: desk lamp, clamp ammeter, tape measure, ST series illuminometer, incandescent lamp, energy-saving lamp, LED lamp, etc.

Experimental location: Physics Experiment Center of Nanchang Hangkong University

(Note: The results of this experiment are only responsible for this experiment)

The reporter purchased three common lamps on the market for experiments, namely 40W incandescent lamps, 10W energy-saving lamps, and 5W LED lamps. The prices are 2 yuan, 10 yuan, and 15 yuan respectively.

"Although the power is marked on the lamp, this data is not the actual power of the lamp, so during the experiment I will ask a 'good friend' - a clamp ammeter to help, use it to measure the actual current of the lamp, and then calculate the actual power of the lamp." Before the experiment begins. , the experimenter said: "Citizens often consider brightness issues when choosing lamps, so in this experiment I will ask another 'good friend' - a light meter to help me test the brightness of three lamps." The first thing to appear was the incandescent lamp. The experimenter installed the incandescent lamp on a desk lamp prepared in advance. After turning on the desk lamp, the current data measured by the clamp ammeter was 0.166A. Experimenters said that in order to obtain accurate and fair data, the experimental standards will be unified. No matter which lamp is tested, the sensor center of the illuminance meter will be placed 30 cm away from the center of the lamp. Finally, the illumination of the incandescent lamp measured by the experimenter was 1.03Klx.

After replacing the energy-saving lamp, the experimenter measured the current to be 0.037A and the illumination to be 0.44Klx. When replaced with LED lights, the measured current generated by the LED lights was 0.032A and the illumination was 1.07Klx.

Through the experimental results, it can be seen that in terms of brightness, LED lamps have a huge gap of more than twice that of energy-saving lamps and become the champion. Incandescent lamps rank second, missing the championship with a gap of 0.04Klx, and energy-saving lamps are at the bottom.

Since the experimenter measured the current during the experiment, the current is not the final data. The reason why the current is tested is to calculate the electricity bill consumed by this lamp. Through calculations, the experimenters concluded that incandescent lamps consume 0.03652 kilowatt-hours of electricity per hour; energy-saving lamps consume 0.00814 kilowatt-hours of electricity per hour; and LED lamps consume 0.00704 kilowatt-hours of electricity per hour.

Interpretation: There is not much difference in cost performance between energy-saving lamps and LED lamps

Ordinary families generally turn on the lights for 5-6 hours a day. If the lights are turned on for 6 hours a day and the electricity is 0.6 yuan per kilowatt hour, Based on the power consumption measured in this experiment, the reporter calculated that the 40W incandescent lamp above costs 47.98 yuan in electricity per year, the 10W energy-saving lamp costs 10.69 yuan in electricity per year, and the 5W LED lamp costs 9.25 yuan in electricity per year. Obviously, using incandescent lamps is the least economical. LED lights are more expensive than energy-saving lamps, but the electricity bill is cheaper.

Zhu Quanshui from the Physics Experiment Center of Nanchang Hangkong University said that according to the national standard GB/T 9473-2008 "Performance Requirements for Reading and Writing Desk Lamps", based on the daily desk lamp being 300mm away from the desktop, the minimum illumination is 250lx. According to the "Indoor Lighting and Lighting Design Requirements" interior decoration is generally 300lx ~ 750lx. If it is a decorative part with a high reflection coefficient such as a white wall, the brightness of 300lx is sufficient. Therefore, in terms of brightness, whether used as a light source for indoor lighting or a table lamp, incandescent lamps, energy-saving lamps and LED lamps all meet the requirements. From a price/performance perspective, there is not much difference between energy-saving lamps and LED lamps.

Experts recommend that students use LED lights

Teacher Zhu also said that although the overall cost performance of the two is similar, he recommends that students use LED lights for desk lamps. Teacher Zhu explained that incandescent lamps emit light through the thermal effect of tungsten filaments. The working principle of energy-saving lamps is the same as that of fluorescent lamps. By heating the filament, they emit electrons that collide with argon atoms and mercury atoms to emit ultraviolet rays. The ultraviolet rays then excite the phosphor to emit light. Therefore, the light produced by energy-saving lamps flickers, and high-strobe energy-saving lamps also produce electromagnetic radiation, which can easily cause damage to children's eyes when used for a long time. The LED lamp uses the electronic effect of semiconductors to emit light, and is a light-emitting device with a low-voltage DC constant current source. Therefore, there are no problems such as flicker and electromagnetic radiation of energy-saving lamps. Therefore, it is recommended that student desk lamps use LED lights for lighting.