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  2. Fluorescent lamps and health - Wikipedia

    en.wikipedia.org/wiki/Fluorescent_lamps_and_health

    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).

  3. Photosensitive epilepsy - Wikipedia

    en.wikipedia.org/wiki/Photosensitive_epilepsy

    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.

  4. Glow switch starter - Wikipedia

    en.wikipedia.org/wiki/Glow_switch_starter

    A preheat fluorescent lamp circuit using automatic starting switch. A: Fluorescent tube, B: Power (+220 volts), C: Starter, D: Switch (bi-metallic thermostat), E: Capacitor, F: Filaments, G: Ballast. When power is first applied to the circuit, there will be a glow discharge across the electrodes in the starter lamp.

  5. Electrical ballast - Wikipedia

    en.wikipedia.org/wiki/Electrical_ballast

    [1] [3] To prevent this, fluorescent tubes are connected to the power line through a ballast. The ballast adds positive impedance (AC resistance) to the circuit to counteract the negative resistance of the tube, limiting the current. [1] Several American magnetic ballasts for fluorescent lamps. The top is a rapid start series autoregulator ...

  6. Fluorescent lamp - Wikipedia

    en.wikipedia.org/wiki/Fluorescent_lamp

    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 ...

  7. Trump's agenda in trouble? What the Republican revolt on ...

    www.aol.com/trumps-agenda-trouble-republican...

    Some Republicans dismissed concerns this week that the failure of Trump's first big policy play - before he's even been sworn in - could spell trouble for his agenda. “Every issue is different ...

  8. Cops reveal tragic cause of death of bride, 26, found on ...

    www.aol.com/cops-reveal-tragic-cause-death...

    Police in have revealed tragic new details behind the mysterious death of a 26-year-old Polish newlywed two years after she was found on the streets of Miami.

  9. Trump announces new ambassadors to Portugal, Malta - AOL

    www.aol.com/trump-announces-ambassadors-portugal...

    President-elect Trump announced two new foreign ambassadors on Tuesday in a Truth Social post. “It is my great honor to announce that John Arrigo will serve as the next United States Ambassador ...

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