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Philips HPL 80W can't believe I found this!!!

Philips HPL 80W can't believe I found this!!!

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eBay find. I swear this classic 1950s Dutch merc lamp was made yesterday! It has Philips' exclusive magnesium arsenate phosphor, it's a close equivalent to the American color improved /C mercs except the latter uses magnesium flurorgermante. The different phosphor allowed Philips to avoid paying Westinghouse for a license to use their phosphor. The envelope is inside frosted, with a somewhat thin phosphor coating. The arc tube has modern pinched seals, but a bit different from later Philips arc tubes. Has narrower pinched ends.

image~428.jpeg image~427.jpeg image~390.jpeg image~389.jpeg

Light Information

Light Information

Manufacturer:Philips
Model Reference:TYP. 57217E/25
Lamp
Lamp Type:Mercury Vapor
Filament/Radiator Type:Quartz arc tube with pinched seals
Base:E-27s
Shape/Finish:PS75, inside frosted plus phosphor coated
Service Life:4000 hours
Electrical
Wattage:80w
Voltage:115V
Current:0.8A
Optical
Lumen Output:2800 lumens
Lumen Efficacy:35 lumens per watt
Color Temperature:4800K
Color Rendering Index:28
Physical/Production
Dimensions:7 inches appromixately
Factory Location:Eindhoven the Netherlands
Fabrication Date:June 1955

File information

File information

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Filename:image~390.jpeg
Album name:silverliner / good ol' mercury vapor
Keywords:Lamps
File Size:796 KB
Date added:Dec 06, 2017
Dimensions:2464 x 1848 pixels
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Date Time:2017:12:06 14:56:23
DateTime Original:2017:12:06 14:56:23
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Focal length:4.15 mm
ISO:80
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sox35
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missriaelaine
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Dec 06, 2017 at 06:20 PM Author: sox35
Wow

Why do I never find things like this

UPDATE 15/12/17 I just have

Ria in Aberdeen
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Mandolin Girl
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Dec 06, 2017 at 06:39 PM Author: Mandolin Girl
Ooh, you are so lucky

Hugs and STUFF Sammi xXx (also in Aberdeen)

There are two kinds of light  -  the glow that illuminates, and the glare that obscures.
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Silverliner
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GoL
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Dec 06, 2017 at 06:52 PM Author: Silverliner
Honestly I never thought this would show up. I got it from a Canadian seller. Very few uses for 80w mercury lamps in North America, prolly why this sat for decades unused along with 3 others which sold to other collectors.

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veryhighonoutput
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T12


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Dec 06, 2017 at 07:26 PM Author: veryhighonoutput
Nice find!

T12/ t17 there's a reason they made heavy magnetic ballasts

funkybulb
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Dec 06, 2017 at 08:55 PM Author: funkybulb
Dave I got the other one that now in my collections
Now that leaves two unconfrimed lamps that seller sold

No LED gadgets, spins too slowly.  Gotta  love preheat and MV. let the lights keep my meter spinning.

Max
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Dec 07, 2017 at 04:01 AM Author: Max
Nice catch Dave, this is a very rare model indeed! The inside bulb frosting is found primarily in very early mercury fluorescent lamps made by the Dutch from the 1940s until the mid 1950s (my HPL 125W from 1956 no longer has such an acid-etched bulb). I think this particular feature was implemented so as to improve the phosphor adhesion to the glass bulb and this was later made unnecessary thanks to improved coating techniques.
By the way, the fluorescent coating consists of magnesium arsenate, not fluoroarsenate. The fluorination was applied to the germanate phosphor only as this was needed in this particular material in order to enhance the red fluorescence output from manganese ions (not needed with the arsenate host material). As for the quartz burner, its design is quite different from that found in today's mercury lamps: the pressed end seals are narrower and more compact, while the electrodes were smaller and still activated with thorium oxide, an electron emitter which was phased out in the late 1950s because it caused too much end blackening, quite a problem in the smaller lamps such as this 80 W model.
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Dec 07, 2017 at 08:37 AM Author: sailormoon_01_uk
Yep I am waiting delivery of 2 of these from Canada myself, yes these were originally designed Magnesium Arsenate Coating in a Pear Shaped bulb got give improved Colour Rendering CRI-28 / Colour Temperature 4800 deg K, and were designed for use on European 80 watt Mercury Control Gear, which originally used Frosted Pear Shaped MB/V (Later MB/U) Mercury Lamps, by the 1960's the HPL mercury Lamp was redesigned with Yttrium Vanadate Coating and the familiar Elliptical Shaped Bulb, which gives Better Colour Rendering CRI-40 / Colour Temperature 4000 deg K.
Silverliner
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GoL
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Dec 08, 2017 at 04:57 PM Author: Silverliner
Thanks Max for the information! I corrected the information in the description. Isn't magnesium arsenate toxic? Gotta treat these oldies with respect, like early fluorescent lamps with zinc beryllium silicates.

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Dec 09, 2017 at 03:53 AM Author: Max
No problem Dave, it's my pleasure. I've read in old Philips literature that magnesium arsenate was mildly toxic only, certainly much less problematic than beryllium phosphors. The Dutch used this material in their deluxe fluorescent tubes during the 1950s and early 60s also.
sox35
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missriaelaine
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Dec 15, 2017 at 08:10 AM Author: sox35
It would appear this seller has quite a few and is "releasing" them onto eBay a couple at a time. I'd be very interested to find out how they made their way to Canada..!

Ria in Aberdeen
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Mar 08, 2020 at 02:26 AM Author: Olav
Gratulation, silverliner. 👍🏻 That's a really rare lamp. Difficult to find in europe, too. So, this moment to get the lamp is 5 years christmas in one time.
sox35
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missriaelaine
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Mar 08, 2020 at 01:07 PM Author: sox35
They are wonderful lamps, one of ours is from 1954

Ria in Aberdeen
It'll be all right in the end, and if it isn't all right, it isn't the end Love

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