Complete Mystery - Replacing E27 Cfl With Led

[ledtrouble]

I have replaced some old E27 CFL bulbs with LED bulbs.

One fitting only switches on with the old CFL bulbs, not LED bulbs.

Please help.

 

[ProDave]

Check the spring contact that makes contact with the outer thread of an E27 lamp (with the power OFF obviously)

I find it's very common to have to tive this a little tweak to get a good contact to the thread.  It seems not all lamps have the same shaped end, so changing to a different lamp may not always work without a bit of "adjustment"

 

[betty swollocks]

Check what voltage you have at the lighting point, I have had a problem similar to this where a customer replaced an existing working cfl fitting with a standard lamp with 3x40w candle bulbs that then wouldn't work, tested at light point revealed only 140v l-n 244v l-cpc @60 v n-cpc. So I assumed floating neutral not connected back to circuit, but enough potential to light an energy saving lamp, I say assumed because customer told me to forget finding the fault and that he could live with the old cfl!

 

[SLIPSHOD & SLAPDASH]

I often find the problem as Dave described in post #2. After turning off, bend the centre contact up a bit. Another problem is sometimes the shoulder of the lamp hits the lampholder or fitting so it does'nt screw all the way in.