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Prefocus torch bulb....why made?

Prefocus torch bulb....why made?

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As a kid, yes years ago in the 50s I first saw this type of bulb and was explained to me why they were introduced. Somebody I knew at that time worked in the Police (flying squad) and was given a torch as part of his tool kit, it used a 4.5v flat battery as I remember and one of this type bulb. It had to produce a clear focus and relied on the bulb to give that every time where as a MES type could vary depending on maker, filament position. Okay this then new lamp became popular in flashlights and had a wide voltage range up to 12v. What made these so good was the type of base called S.C. miniature flanged and the way the filament was made and supported, by this I mean one of the lead in wires would be extended and end up in that little pip, ensuring the filament would always be central. Now these are made without this but the bulb shape remains the same with that little pip. Lamps of this type are called PR type and used widely in torches (flashlights).

P1070960.JPG P10709592028229.JPG P10709552028229.JPG P10709492028229.JPG

Light Information

Light Information

Manufacturer:Philips
Model Reference:PR type
Lamp
Lamp Type:Incandescent
Filament/Radiator Type:C-2R
Base:Prefocus miniature
Electrical
Voltage:3.5v
Current:0.4a
Physical/Production
Dimensions:Torchbulb
Factory Location:India
Fabrication Date:60S 70S ?
Application/Use:Torchbulb

File information

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Filename:P10709552028229.JPG
Album name:migette1 / Migette1
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Date added:Feb 09, 2020
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Date Time:2020:02:09 10:19:02
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Comments
Australianstig
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Feb 09, 2020 at 05:53 AM Author: Australianstig
Although starting with lamps like this, a fair amount of my childhood was spent making LEGO road settings and packing them with LEDs for street lights, traffic lights, car and house lights so you could say that my ideas for LED street lights have been around for 35 years
Alex
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Mit dem Osten Siegen!


Alex_lightning jurgenneandertal
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Feb 09, 2020 at 10:16 AM Author: Alex
I never sew on without the tip holder, expecting the halogen version wich was made by Narva or by Philips

Lamp and Valve collector

migette1
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Peter


migette1
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Feb 09, 2020 at 11:07 AM Author: migette1
Yes they did make them I will try and find one, the halogen ones were slightly different shape and different filament....Good idea with those LEGO street lights.

Interested in the history of electric lighting and incandescent in particular and neon glow lamps.

Iain P
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Feb 15, 2020 at 12:29 AM Author: Iain P
I'm a newbie here, joined yesterday, and I have one of these bulbs. My first post was going to be to ask why the lead wire goes all the way into the top, but you've answered the question, thank you
Iain
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