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UN Regulation 37 covers motor vehicle filament lamps. These are categorized in three groups: those without general restriction that can be used in any application, those acceptable only for signalling lights (not for road illumination lamps), and those no longer allowable as light sources for new type approvals but still permitted for production as replacement parts.
60 W incandescent light bulb with energy efficiency class E Equivalent 42 W halogen incandescent light bulb with efficiency class C Compact fluorescent lamp LED lamp circa 2021. Various governments have passed legislation to phase out manufacturing or importation of incandescent light bulbs for general lighting in favor of more energy-efficient ...
Color corrected" mercury bulbs overcome this problem with a phosphor on the inside of the outer bulb that emits at the red wavelengths, offering whiter light and better color rendition. Mercury-vapor lights operate at an internal pressure of around one atmosphere and require special fixtures, as well as an electrical ballast. They also require ...
Low-pressure sodium lamps give only monochromatic yellow light, inhibiting color vision at night. Single ended self-starting lamps are insulated with a mica disc and contained in a borosilicate glass gas discharge tube (arc tube) with a metal cap. [3] [4] They include the sodium-vapor lamp that is the gas-discharge lamp used in street lighting ...
The French yellow-light mandate was based on observations by the French Academy of Sciences in 1934, when the academy recorded that the selective yellow light was less dazzling than white light and that the light diffused less in fog than green or blue lights. [citation needed] Yellow light was obtained by dint of yellow glass for the headlight ...
Cyclops bicuspidatus is a planktonic species of copepod found throughout the world, except Australia, [4] and characteristic of the Great Lakes of North America. [5] It is a deep water species found throughout the year with peak abundance occurring in May or June. [ 5 ]
Cyclops is one of the most common genera of freshwater copepods, comprising over 400 species. [ 1 ] [ 2 ] Together with other similar-sized non-copepod fresh-water crustaceans , especially cladocera , they are commonly called water fleas .
A stout fly with a small head (10-14 mm in length). [9] The tergites are black, without the dust spots or blue-purple sheen of other Merodon species. The thorax and abdomen are hidden by dense, long, erect hairs of variable colouration.