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The bulb has its own power supply. [4] The Palace Theater Light was once thought to be the longest-running light bulb in the world. [5] [3] It appeared in the 1970 edition of the Guinness Book of World Records before it was replaced by the Centennial Light two years later when it was discovered to be older.
The suffix after the G indicates the pin spread; the G dates to the use of Glass for the original bulbs. GU usually also indicates that the lamp provides a mechanism for physical support by the luminaire: in some cases, each pin has a short section of larger diameter at the end (sometimes described as a "peg" rather than a "pin" [2]); the socket allows the bulb to lock into place by twisting ...
CFLs that use 25 to 40 watts of electricity will have total mercury content capped at 6 mg per unit." [6] Only a few tenths of a milligram of mercury are required to maintain the vapor, but lamps must include more mercury to compensate for the mercury absorbed by internal parts of the lamp, which is no longer available to maintain the arc.
Available in numerous spot and flood beam spreads. Like all light bulbs, the number represents the diameter of the bulb in 1 ⁄ 8 of an inch. Therefore, a PAR 16 is 51 mm (2 in) in diameter, a PAR 20 is 64 mm (2.5 in) in diameter, PAR 30 is 95 mm (3.75 in) and a PAR 38 is 121 mm (4.75 in) in diameter. A package of four 60-watt light bulbs
A commonly used light in the home in the 1960s in 220–240 V countries was a circular tube ballasted by an under-run regular mains filament lamp. Self ballasted mercury-vapor lamps incorporate ordinary tungsten filaments within the overall envelope of the lamp to act as the ballast, and it supplements the otherwise lacking red area of the ...
GE Chroma 50/Philips Colortone 50/Sylvania Design 50 ≈90-99 5000 D-SDL, D-EDL 55 DX Deluxe Daylight/Northlight/Colour Matching ≈88-98 6500 N/A N/A C75 GE Chroma 75/Philips Colortone 75 ≈92 7500 700-series tubes (Calcium halophosphate and rare-earths tri-phosphor blend) Numeric color code Alphanumeric color code Color Approximate CRI
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Incandescent, halogen and HMI light sources use this design. Medium bi-post (G22) is used with film & stage lighting fixtures between 250 and 1000 watts. Mini bi-post (G4-G6) Common types: G4 – 4 mm (0.15748 in) pin spacing GU4 & GZ4 – same as G4 and only denote what lamp mount clip is needed to hold the actual light bulb in place