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Fluorescent lamps with magnetic ballasts flicker at a normally unnoticeable frequency of 100 or 120 Hz and this flickering can cause problems for some individuals with light sensitivity; [69] they are listed as problematic for some individuals with autism, epilepsy, [70] lupus, [71] chronic fatigue syndrome, Lyme disease, [72] and vertigo. [73]
In 1925, Marvin Pipkin, an American chemist, patented a process for frosting the inside of lamp bulbs without weakening them. [73] In 1947, he patented a process for coating the inside of lamps with silica. [74] In 1930, Hungarian Imre Bródy filled lamps with krypton gas rather than argon, and designed a process to obtain krypton from air.
A compact fluorescent lamp (CFL), also called compact fluorescent light, energy-saving light and compact fluorescent tube, is a fluorescent lamp designed to replace an incandescent light bulb; some types fit into light fixtures designed for incandescent bulbs.
It was $73 on Black Friday, but now you can save $10 more on it if you buy it right now. ... a lamp or more while the bottom shelves do the hard work of hiding kitchen clutter. ...
The 1972–73 daytime network television schedule for the three major English-language commercial broadcast networks in the United States covers the weekday and weekend daytime hours from September 1972 to August 1973. All times are Eastern and Pacific.
The new Pennsylvania plant made a partial start in March 1896, and a full force started on the following week. [73] Kopp eventually left the company and started the Kopp Lamp and Glass Company in 1900, with operations starting in 1901. [74] The Corapolis works of Consolidated Lamp and Glass Company operated until 1964. [75]