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Old 1st Mar 2020, 10:22 am   #1
Colourstar
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Default Old and new strip light sizes

Hello all,

I need to replace the original hob light in an early 60s cooker. The trouble is that the nearest modern equivalent size of 284mm (LED version) is just slightly too short by a few mm and won't sit in the holders. The design of the end holders in the cooker is such that they can't be bent inward or moved as they are on rigid brackets with a locating stud in the casing of the lamp hood.

Have to admit I'm a bit stuck with this one!

The second photo shows the size discrepancy with the left-hand caps of both lamps dead in line.

Steve
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Old 1st Mar 2020, 10:41 am   #2
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Default Re: Old and new strip light sizes

My first thought would be to add some sort of extensions on the ends to bridge the gap between the contacts in the lamp and those in the holder, but this does rather depend on how the lamp is held at each end. An image of the holder may be helpful.
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Old 1st Mar 2020, 10:50 am   #3
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Default Re: Old and new strip light sizes

Here you go, Dave.... The holders are porcelain with a sprung solid brass plunger.
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Old 1st Mar 2020, 11:06 am   #4
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Default Re: Old and new strip light sizes

Move one of the holders? Slotting the fixing holes shouldn't be too difficult.

Moving it back if you find an original later would be easy, too.

LED strip might be a bit unhappy with stove ambient temperatures anyway.
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Old 1st Mar 2020, 12:52 pm   #5
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Default Re: Old and new strip light sizes

All the lamps these days are not from proper manufactures. I have had filament ones to long and had to file a bit off to get them to fit.
Just one idea with yours. As long as the ends are not aluminium would it be possible to solder a couple washers on the end of the lamp to space it out .Andy
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Old 1st Mar 2020, 1:12 pm   #6
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Default Re: Old and new strip light sizes

I had a similar problem whe replacing the 1000W quarz bulb of an old movielight with a slighty shorter 300W one. I found a tubular rivet (it might have been an eyelet) that fitted over the contact in the holder that was just long enough to make the bulb fit. I only needed to fit it at one end.
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Old 1st Mar 2020, 4:16 pm   #7
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Default Re: Old and new strip light sizes

Hi Steve,
I can't believe the proper lamps are no longer obtainable: that's the route I would go down rather than LED. There must be people on here who could find a few in their stocks, after all these were everywhere at one point. Might be worth a wanted post!

Cheers
Nick
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Old 1st Mar 2020, 5:48 pm   #8
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Default Re: Old and new strip light sizes

Is it a reputable make? 284mm is 284mm, surely. If it's short then it must be out of spec.

A look on the Energiser datasheet (CPC) states a max ambient temperature of 40C.

Filament striplights still available.
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Old 1st Mar 2020, 6:37 pm   #9
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Default Re: Old and new strip light sizes

I have had this problem with some ordinary screw based light bulb, a blob of solder on the end have worked for me. Otherwise solder some washers or similar as suggested by bionicmerlin.

A possible problem though may be if there is a wire soldered to the end cap inside the lamp, it may fall off. Or the plastic may melt if it gets too hot.
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Old 1st Mar 2020, 8:13 pm   #10
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Default Re: Old and new strip light sizes

Thanks for the replies. The LED striplight is just what I had to hand (purchased when they were on clearance at 50p each in Morrisons some months ago!) It does measure 284mm- it's the older lamp that is slightly longer. I think I'll find myself a proper filament strip lamp and see how it compares. If there is still a size difference I think I'll go down the route of elongating the mounting holes for one of the end holders to give a bit of leeway, as suggested by Herald 13/60.

I've never come across this problem before, so I was interested to see if anyone else had.

I'll return to this when I've got hold of another lamp....

Steve
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Old 1st Mar 2020, 9:00 pm   #11
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Default Re: Old and new strip light sizes

Re #9, my understanding is that the threaded portion of the ES lamp base used in the US is shorter by one turn than that of the European ES base. Possibly the lamp had a US spec base.
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Old 1st Mar 2020, 9:32 pm   #12
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Default Re: Old and new strip light sizes

I was playing with an old (filament) striplight today so just measured the lamp = 284mm.
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Old 2nd Mar 2020, 11:39 am   #13
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Default Re: Old and new strip light sizes

284mm sounds rather like 11" plus a couple of solder blobs
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Old 2nd Mar 2020, 12:58 pm   #14
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Default Re: Old and new strip light sizes

You know Steve, I've just had a similar problem and gave up with my attempt to use an LED one. I went for a good old-fashioned filament type like this:-
https://www.ebay.co.uk/itm/60w-284mm...IAAOSw5-9c3s9Y
Best of luck,
Andy
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Old 2nd Mar 2020, 1:03 pm   #15
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Default Re: Old and new strip light sizes

Ah, sorry Steve, wrong end of the stick. So your original is greater than 284mm, not that the replacement was less than 284mm? Mmm...
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Old 7th Mar 2020, 11:59 am   #16
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Default Re: Old and new strip light sizes

I've now acquired a 284mm traditional filament striplight from the local hardware shop. Out of interest I lined it up with the others so the left-hand end caps are all dead level. If anything it's just fractionally longer than the original. Anyway it fits, which is the important thing!


The photo shops from the top:

LED strip lamp
New filament strip lamp
Original 1960s filament lamp from cooker

All of which seems to show that 284mm is not always 284mm. The imperial size by the way is officially 11 1/4". The packet of the new lamp states both sizes.

Steve
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Old 7th Mar 2020, 2:37 pm   #17
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Default Re: Old and new strip light sizes

The fittings I originally had in my old kitchen were 284mm size and both ends were spring loaded as that was how you inserted the lamp by pushing against one of the springs. In one of them fitting became intermittent and I thought it might be short lamp but the cause was a broken spring in one end. Found a spring to do the job.
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Old 7th Mar 2020, 6:37 pm   #18
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Default Re: Old and new strip light sizes

So, is it a case of when is 284mm 284mm then? So much for standards eh. Pleased you sorted it Steve!
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