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Many operating room lights used halogen lamps [1] [2] or xenon lamps, [3] some with backup lamps that operated in case of lamp failure [4] until the advent of Light-emitting diodes as light sources since 2007 [5] which remove the problem of heat radiation and reduce energy requirements. [6]
The main attraction of the bridge is the single pylon which contains 384 light emitting diode fixtures that can create 16.7 million color combinations. The LEDs shine through the glass facing on all four sides of upper 196 feet of the main pylon. These lights can be visible up to 3 miles (4.8 km) away.
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A high-pressure sodium street light in Toronto A high-pressure sodium-vapor lamp An HPS lamp that isn't entirely off. A sodium-vapor lamp is a gas-discharge lamp that uses sodium in an excited state to produce light at a characteristic wavelength near 589 nm.
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PMMA transmits up to 92% of visible light (3 mm (0.12 in) thickness), [18] and gives a reflection of about 4% from each of its surfaces due to its refractive index (1.4905 at 589.3 nm). [3] It filters ultraviolet (UV) light at wavelengths below about 300 nm (similar to ordinary window glass).
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In 2019, Christiana Hospital was the only hospital in the state to be named to the Becker's Hospital Review list of "100 great hospitals in America". [ 24 ] In 2020, Christiana Hospital was ranked as #92 overall (and #1 in Delaware) on the Newsweek list of the best hospitals in the United States. [ 25 ]