High pressure mercury vapour lamps
Low luminous efficacy, moderate colour rendering properties and the introduction of the halogen metal halide lamp with its much better performance all round are the main reasons that high pressure mercury vapour lamps are hardly used any more today. In street lighting, high pressure mercury vapour lamps have been all but totally superseded by high pressure sodium vapour lamps. In accordance to the Commission Regulation No. 245/2009 this lamp type will be phased out in 2016.
The arc tube of a high pressure mercury vapour lamp has an internal fluorescent coating which absorbs UV radiation. A ballast is required for operation; auxiliary electrodes are used for ignition.
|Power consumption(Watts)||50 - 1.000|
|Luminous flux (lumens)||1.800 - 58.000|
|Luminous efficacy (lumens/Watts)||36 - 58|
|Light colour||warm white, neutral white|
|Colour rendering index Ra||40 - 69|
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