Energy-saving lamps radiate "safety clearance" to human body

January 16, 2019

Recently, some netizens broke the news that the self-measurement of energy-saving lamps found that the radiation was seriously exceeded. Within 10 cm, nearly 10 different brands of energy-saving lamps had electric field strengths exceeding 200 V/m, and OSRAM’s electric energy intensity of an energy-saving lamp was even stronger. It is more than 1600V/m, far higher than the national standard "Electromagnetic Radiation Protection Regulations" (GB8702-1988) in the "public exposure limit of 40 volts / meter or less," which has attracted no attention.

Is an energy-saving lamp really a "radiation lamp"? Yesterday, the reporter went to the National Electric Light Source Quality Inspection Center (Shanghai) and witnessed the entire process of an “Energy Efficient Lamp Human Radiation Hazard Assessment” trial.

Energy-saving lamps "safety clearance"

Into a professional inspection room of the quality inspection center, only to see the detection equipment is ready, from top to bottom by a fixed light bulb wooden bracket, 210 mm diameter metal ball (simulated human brain), protection network (simulated human body The resistance and capacitance), coaxial cable and receiver.

This set of equipment seems very simple, in fact, can be "Tibetan" a lot of stress. “Regularly testing electromagnetic radiation needs to avoid interference as much as possible, so the wooden bracket cannot have a nail. Mobile phones and other electronic devices are not allowed to come in.” According to relevant technical experts, the so-called electromagnetic radiation impact on the human body is mainly caused by the brain. Conducted through the neck, and the method of detection is to simulate the entire process.

After installing a brand of energy-saving light bulbs brought by a reporter, a staff member took out a ruler and repeatedly checked and fixed the lamp tube at a height of 30 cm from the metal ball. "After plugging in the power supply, we will check the current density at a frequency of 20 kHz to 10 MHz. This range already covers the current range where the energy-saving lamp operates."

After nearly an hour of testing and analysis, the radiation result measured by this energy-saving lamp was “0.0541”, far lower than the “0.85” standard limit, which means that the human body radiation test “safely passes”.

User test has "loopholes"

Why does formal testing and online experimentation produce completely different results? Yu Anqi, director of the Shanghai Illuminating Society, told reporters that there are at least three "fatal flaws" in online circulation.

First of all, there is a “stabilization time” before the detection of energy-saving lamps, which means that the power emitted from the bulbs is basically stable, which takes at least 15 minutes, and the users' experiments do not add up to more than 3 minutes.

Second, test equipment and energy-saving lamps that are sources of radiation are likely to interfere with each other. If you want to measure truly accurate data, according to current standards, the distance between the two should be 30 cm, and the vertical error should not exceed 1.5 cm. "The data the netizen took a probe and sticking to the bulb was definitely inaccurate," said Yu Anqi.

Third, the 200 volts/meter or even more than 1600 volts/meter measured by netizens may seem a little scary at first glance. It actually refers to the strength of the electric field. With this indicator alone, it cannot be assumed that the radiation of this energy-saving lamp will affect the radiation. human body. “To judge electromagnetic radiation, we must distinguish the nature of the radiation source. The power of an energy-saving lamp is very small. Even if the electric field strength is high, it cannot explain the problem,” said Lin Yandan, an associate professor at the Institute of Electric Light Sources at Fudan University, who likened the image metaphor to diamonds. Hardness is very strong, but if a diamond with a very small mass falls on a person, it may not even feel it at all. "In fact, it is 'induced current' that causes substantial damage to the human body."

Domestic standards will soon be introduced. In fact, the so-called “standards” adopted by netizens—the “National Standard for Electromagnetic Radiation Protection” are not used to detect energy-saving lamps. The reporter learned from the city quality supervision department that “Evaluation of electromagnetic radiation from lighting equipment to human body” is the current IEC (International Electrotechnical Commission) standard that has been confirmed by the International Commission on Non-Ionizing Radiation Protection, and it is also the only lighting equipment in the world that emits electromagnetic radiation to the human body. Hazard protection standards, given the human body radiation limits and radiation limit test methods. According to reports, the standard for human electromagnetic radiation on the human body has been completed in the approval draft last year and is expected to be approved and promulgated this year.

"Under normal use conditions, energy-saving lamps can be used with confidence, the public do not have to worry," Yu Anqi listed an energy-saving lamp at ease to use "tips" - lamp height is less than 50 cm, the best choice for power less than 18 watts; Above 50 cm can basically not consider the power size; and the use of energy-saving lamps such as bedside lamps may be close to 10 watts. Under this condition, even if the human body is close to the energy-saving lamp, it will not affect human health.

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