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Mercury lamp Good view of the arc tube in these old unfrosted reflector mercury lamps. Shown at start-up. In this 400W Philips version they have also gone to the trouble of having start electrodes at both ends of the arc tube. Keywords: Lamps

Mercury lamp


Good view of the arc tube in these old unfrosted reflector mercury lamps. Shown at start-up. In this 400W Philips version they have also gone to the trouble of having start electrodes at both ends of the arc tube.

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Lamp/Fixture Information
Manufacturer:Philips
Model Reference:HPRL
Lamp
Lamp Type:mercury vapour
Electrical
Wattage:400
Physical/Production
Factory Location:Belgium
Fabrication Date:1988
Application/Use:high bay industrial
File information
Filename:HPLR400.jpg
Album name:Tuopeek / Mercury Vapour
Keywords:Lamps
Filesize:227 KiB
Date added:11 Dec 2025
Dimensions:2500 x 1931 pixels
Displayed:189 times
DateTime Original:2025:12:11 20:22:16
Exposure Time:1/250 sec
FNumber:f/7.1
File Source:Digital Still Camera
Flash:No Flash
Focal length:42 mm
ISO:200
Model:NIKON D3400
Software:Adobe Photoshop Elements 2.0
White Balance:0
URL:https://trad-lighting.net/gallery/displayimage.php?pid=1067
Favourites:Add to Favourites

Comment 1 to 1 of 1
Page: 1

Max   [Fri 12 Dec 2025 at 08:17]
At that time it was customary for Philips to fit their mid-high wattage HPL-N lamps with two starting probes. This ensured a more reliable ignition under all weather conditions, and extended the lamp's service life. Mercury lamp R&D at Philips really shifted its focus to reliability and durability during the early 1980s, which led to improvements in design and manufacturing processes, eventually resulting in the HPL4 in April 2003.

Comment 1 to 1 of 1
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