Mercury-vapor lamp | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-23

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Mercury-vapor_lamp


00:01:57 1 Origins
00:03:43 2 Principle of operation
00:06:28 2.1 Metal halide
00:07:28 2.2 Self-ballasted lamps
00:08:23 3 Operation
00:09:55 3.1 Color considerations
00:11:21 3.2 Emission line spectrum
00:12:28 4 Usage of low-pressure lamps for surface cleaning
00:13:17 5 Light pollution considerations
00:13:55 6 Bans
00:14:58 7 Ultraviolet hazards
00:16:55 8 Uses
00:17:04 8.1 Area and street lighting
00:17:25 8.2 UV Curing
00:17:55 8.3 Molecular spectroscopy
00:18:31 8.4 Projection
00:19:16 9 See also
00:19:24 10 References
00:19:38 11 Further reading



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SUMMARY
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A mercury-vapor lamp is a gas discharge lamp that uses an electric arc through vaporized mercury to produce light. The arc discharge is generally confined to a small fused quartz arc tube mounted within a larger borosilicate glass bulb. The outer bulb may be clear or coated with a phosphor; in either case, the outer bulb provides thermal insulation, protection from the ultraviolet radiation the light produces, and a convenient mounting for the fused quartz arc tube.
Mercury vapor lamps are more energy efficient than incandescent and most fluorescent lights, with luminous efficacies of 35 to 65 lumens/watt.  Their other advantages are a long bulb lifetime in the range of 24,000 hours and a high intensity, clear white light output.  For these reasons, they are used for large area overhead lighting, such as in factories, warehouses, and sports arenas as well as for streetlights.  Clear mercury lamps produce white light with a bluish-green tint due to mercury's combination of spectral lines.  This is not flattering to human skin color, so such lamps are typically not used in retail stores.   "Color corrected" mercury bulbs overcome this problem with a phosphor on the inside of the outer bulb that emits white light, offering better color rendition.
They operate at an internal pressure of around one atmosphere and require special fixtures, as well as an electrical ballast.  They also require a warm-up period of 4 – 7 minutes to reach full light output.   Mercury vapor lamps are becoming obsolete due to the higher efficiency and better color balance of metal halide lamps.