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New lighting systems have not used magnetic ballasts since the turn of the century, however some older installations still remain. Fluorescent lamps with magnetic ballasts flicker at a normally unnoticeable frequency of 100 or 120 Hz (twice of the utility frequency; the lamp is lit on both the positive and negative half-wave of a cycle).
The phosphors lining the lamp degrade with time as well, until a lamp no longer produces an acceptable fraction of its initial light output. Failure of the integral electronic ballast of a compact fluorescent bulb will also end its usable life. Compact fluorescent lamp that has reached end of life because of mercury adsorption. Light is ...
However, a faulty fluorescent lamp can flicker at a much lower rate and trigger seizures. [medical citation needed] Newer high-efficiency compact fluorescent lamps (CFL) with electronic ballast circuits operate at much higher frequencies (10–20 kHz) not normally perceivable by the human eye, though defective lights can still cause problems.
Fluorescent lamps using conventional magnetic ballasts flicker at twice the supply frequency. Electronic ballasts do not produce light flicker since the phosphor persistence is longer than a half cycle of the higher operation frequency of 20 kHz. The 100–120 Hz flicker produced by magnetic ballasts is associated with headaches and eyestrain. [8]
Discharge tubes with hot cathodes have an envelope filled with low-pressure gas and containing two electrodes. Hot cathode devices include common vacuum tubes, fluorescent lamps, high-pressure discharge lamps and vacuum fluorescent displays. The surface of cold cathodes can emit secondary electrons at a ratio greater than unity (breakdown). An ...
As captured in photos by Orange Blossom Photography and a video that went viral, the toddler couldn't contain his excitement when he saw his mother at the end of the aisle. "Hey, Mom!" "Hey, Mom!"
Common symptoms of food poisoning include stomach aches and pain, nausea, fever, vomiting, diarrhea and headache. "Those most at risk for severe foodborne illness include children under 5 ...
What reviewers say 💬. More than 13,000 Amazon shoppers can't get enough of the Zesica Turtleneck Batwing Sleeve Sweater.. Pros 👍 "Really great quality sweater," said one five-star fan ...
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