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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). This flickering can cause problems for some individuals with light sensitivity [1] and are associated with headaches and eyestrain.
Slightly over half of all lines of code were licensed under the GPL. The Linux kernel itself was 2.4 million lines of code, or 8% of the total. In a later study, the same analysis was performed for Debian version 4.0 (etch, which was released in 2007).
Light tube. Light tubes (also known as solar pipes, tubular skylights or sun tunnels [1]) are structures that transmit or distribute natural or artificial light for the purpose of illumination and are examples of optical waveguides . In their application to daylighting, they are also often called tubular daylighting devices, sun pipes, sun ...
A light beam or beam of light is a directional projection of light energy radiating from a light source. Sunlight forms a light beam (a sunbeam) when filtered through media such as clouds, foliage, or windows. To artificially produce a light beam, a lamp and a parabolic reflector is used in many lighting devices such as spotlights, car ...
Updated July 2, 2024 at 2:58 PM. Jamie Foxx has shed new light on his health scare that left him hospitalized in April 2023, revealing it all started with a headache that escalated to a medical ...
Producer (s) Joe Brooks. Music video. "Kasey Cisyk and Didi Conn - You Light Up My Life (1977)" on YouTube. " You Light Up My Life " is a ballad written by Joseph Brooks, and originally recorded by Kasey Cisyk for the soundtrack album to the 1977 film of the same title. [1] The song was lip synced in the film by its lead actress, Didi Conn.
Three-point lighting is a standard method used in visual media such as theatre, video, film, still photography, computer-generated imagery and 3D computer graphics. [1] By using three separate positions, the photographer can illuminate the shot's subject (such as a person) however desired, while also controlling (or eliminating) the shading and ...
Celestial and atmospheric light. Moonlight – Light that reaches Earth from the Moon. Planetshine – Illumination by reflected sunlight from a planet. Earthshine – Light reflected from the Earth. Pages displaying short descriptions of redirect targets. Zodiacal light – Faint solar glow caused by interplanetary dust at sunset and sunrise.