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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. Flicker fusion threshold - Wikipedia

   en.wikipedia.org/wiki/Flicker_fusion_threshold

   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]

4. Fluorescence - Wikipedia

   en.wikipedia.org/wiki/Fluorescence

   An electric discharge in the tube causes the mercury atoms to emit mostly ultraviolet light. The tube is lined with a coating of a fluorescent material, called the phosphor, which absorbs ultraviolet light and re-emits visible light. Fluorescent lighting is more energy-efficient than incandescent lighting elements.

5. List of movie television channels - Wikipedia

   en.wikipedia.org/wiki/List_of_movie_television...

   Movie channels are television specialty channels that present film content. Popular movie channels: 7flix (Australia) ABS-CBN Corporation. Cine Mo! (Philippines) Cinema One (Philippines) Movie Central (Philippines) AMC Networks. AMC (United States) AMC (Latin America) AMC (Portugal and Spain) AMC (Europe) Canal Hollywood (Portugal and Spain)

6. Explainer-What is fluoride and why is it added to the US ...

   www.aol.com/news/explainer-fluoride-why-added-us...

   Here is what you need to know about fluoridation of drinking water as a public health measure. Fluoride is a mineral that occurs naturally in water, soil and air that has been demonstrated to ...

7. 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.

8. The dangers of LED face masks you should know about - AOL

   www.aol.com/lifestyle/dangers-led-face-masks...

   Said Palep, "At-home LED devices use lower frequencies, so [they] haven’t proven to be as effective or the results as dramatic as in-office treatments like the Blu-U light and micro pulsed Nd ...

9. Biofluorescence - Wikipedia

   en.wikipedia.org/wiki/Biofluorescence

   Biofluorescence is fluorescence exhibited by a living organism: part of the organism absorbs light or other radiation at one wavelength and emits visible light at another, usually longer. The absorbed radiation is often blue or ultraviolet , while the light emitted is typically green, red, or anything in between.