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Old 22nd Aug 2021, 7:35 pm   #1
Tom williams
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Default Philips SL25 fluorescent light

Hi all,

I recently got this Philips SL25 bulb from a charity shop, it still works and is in fairly good condition. could someone please help me with dating it as I would quite like to know how old it actually is.

Pictures below.

Tom
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Old 22nd Aug 2021, 7:41 pm   #2
Trifocaltrev
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Default Re: Philips SL25 fluorescent light

Hi Tom, I have one still in use in my shed, I bought it new in 1984 when they first appeared in my local lighting shop.

Regards
Trevor.
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Old 22nd Aug 2021, 8:08 pm   #3
Brigham
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Default Re: Philips SL25 fluorescent light

This is one of the new-type 'compact fluorescent lamps' which are, seemingly, going to make the ordinary light-bulb obsolete.
Let's hope it doesn't catch on. It looks like an environmental disaster to me.
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Old 22nd Aug 2021, 8:24 pm   #4
Trifocaltrev
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Default Re: Philips SL25 fluorescent light

These have not been made for many years are are not a new type.

You might find the video below interesting.

Regards
Trevor.

https://www.youtube.com/watch?v=6hsTngduKJQ
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Old 22nd Aug 2021, 8:25 pm   #5
duncanlowe
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Default Re: Philips SL25 fluorescent light

1984 sounds about right to me, too. I bought one for my parents, I think just before I went to Uni, which was later in 1984. They hated it!
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Old 22nd Aug 2021, 8:25 pm   #6
Paul_RK
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Default Re: Philips SL25 fluorescent light

Lamptech.co.uk have online a Philips Lighting catalogue from 1989/90 which still includes this exact style of lamp - SL9, 13, 18 and 25, equivalent to incandescent lamps of 40, 60, 75 and 100W respectively. I'm pretty sure the charcoal-based versions preceded these with white bases.

Paul
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Old 22nd Aug 2021, 10:26 pm   #7
Rhgbristol
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Default Re: Philips SL25 fluorescent light

The Philips SL retrofit lamps first appeared in the UK, in about 1982/83.
Original ones had a dark green / charcoal base which then changed to white base in about 1985/86.

By about 1987, the white base remained, but the whole assembly became slightly narrower, with more of a sweeping taper towards the lamp cap, compared to the early wider type.

Yours seems to be the narrower type.

By about 1990, the lamps changed completely to the stick type, and lost their outer glass housing.

Yours would date from about 1987-1990.

I was in the trade at the time, and remember the changes quite well.

They were expensive lamps when first introduced - not far off £10 each.

They were Philips competitor to the Thorn 2D lamp - and started the move to retrofit compact fluorescent lamps - and set the scene for the demise of the incandescent GLS filament lamp.
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Old 23rd Aug 2021, 7:19 am   #8
Paul_RK
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Default Re: Philips SL25 fluorescent light

Quote:
Originally Posted by Rhgbristol View Post
By about 1990, the lamps changed completely to the stick type, and lost their outer glass housing.
Yes, those are in the '89/'90 Philips Lighting catalogue too, as well as versions with spherical white glass bulbs. It's here should anyone want it, a few hundred pages of download:

http://www.lamptech.co.uk/Documents/...01989%20UK.pdf

Paul
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Old 23rd Aug 2021, 8:57 pm   #9
bobhowe
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Default Re: Philips SL25 fluorescent light

Hi Tom from another thread here is a picture of my SL18 this is a Sylvania Cheetah ES version .These were made in the Philips factory in Holland and were branded Mazda , Osram . Philips , Syvania . This ls the first time this lamp has been switched on since about 1990 kind regards Bob
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