Strip Light changes in standard dimension?

[iannewby]

Question about the standard size that these come in - have they changed in last decade?
I have several nominal 11.25in fixtures that the only available size close to i can find is 284mm -
these fall out because too short!!
Any advice where i can get the older (longer) bulbs??
thanks ian

 

[Leyland30]

I'm assuming we are talking a T5 fluorescent - 12" 8w versions are available at screwfix (and other electrical retailers). Are these not suitable.
Let us know how you get on.

 

[iannewby]

SSOORRYY!!
I missed out an important bit - They are the INCANDESCENT type, about 1inch diameter with a connector at each end. Think they might be S15

 

[snowhead]

When did you last buy a lamp that fitted correctly?

Is the 11.24" measured from an old lamp or the fitting?

How old are the fittings?

My own shaver light is 29 years old and that's 284mm, still on the original lamp as well.

There's only 1.75mm difference, the lamp shouldn't fall out

 

[iannewby]

Probably bought a bulb within last 5 years - they lasted well!
The fittings must be +/- >20yrs .. in house before we bought
Definitely not a fitting problem, the sockets at each end are sprung to allow bulb replacement - i have kept the old bulbs Two manufacturers - a Pifco (no model or other number) and another brand without model number but a stylised "M" in a black oval
All a bit of a mystery!!

 

[HandySparks]

As far as I'm aware, there have only been two commonly available sizes of these lamps. They appear to be 221mm and 284mm.
Tubular Strip Lamps LED - https://www.tlc-direct.co.uk/Main_Index/Lighting_Menu_Index/Lamps_and_Tubes_Index/Tubular_Strip_Lamps/index.html

Is it possible that there's some fault with the contacts or lampholders, that's causing the new lamps to fall out.

If you put an old lamp alongside a new one, what's the difference in length?

 

[Richard Burns]

The springs have probably weakened over time and are not now pushing back correctly.
Make sure that the lamp holder is not obstructed slightly and that the springs are free to move.

 

[iannewby]

Thanks for the thoughts, but none of those things correct! I still have the original bulbs they are longer than todays replacement - the two i mention above slightly different lengths but both fit in their (original) fixtures. The spring retainers in each case is good and works- an easy fit, not jammed / no damage to the holders!
Difference in length about mm
I'll send photos next post!

 

[snowhead]

Thorn catalogue 1969/1970.

http://www.lamptech.co.uk/Documents/Catalogues/Cat Thorn UK 1969.pdf

PDF page 52 or Catalogue page CG7
Double cap tubular 284mm

Maybe the O.P's is an IKEA lamp, they're sometimes obscure.