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I have two lights on same circuit served by a single switch. Two filament bulbs work fine. One filament bulb plus one LED work fine in either position. Two LEDs will not light up (normally). If I switch on they momentarily light up, then go out, with one bulb nearest the switch going on and off rapidly. Very occasionally they will both come on when switched on (about twice in six last months). Also very occasionally (again about twice in six months)they will come on after many attempts in switching on and off. Anyone got any ideas?
 
Thank you guys for all your replies. There have been no alterations. Filament bulbs work fine either as a pair or if only one is fitted with the LED bulb( in other words in any combination, in either position, as long as one of the bulbs is filament). The bulbs I am using are TCP LED, 60W, Bayonet fitting, working off 240volt mains. I have tried re-seating the bulbs several times to check good contact in the socket. In any case there is always a good contact when an LED bulb is used with a filament bulb in the other socket!
 
I have a similar arrangement in the kitchen which is adjacent to the room with the problem (study). In the kitchen I have the same set-up i.e. a single switch (non-dimmable)in a two bulb 240 v circuit. I use the same type and manufacturer LED bulbs, but the fitting is ES. The bulbs in the kitchen work fine (several months of operation) However, I don't think the type of fitting is the problem, because I can get the bulbs in the study to work, with no fiddling around trying to get good contact in the socket, provided one of them is a filament bulb - as described above. I am baffled!
 
I have an upstairs bedroom, again with the same arrangement - One switch, two bulbs. The sockets here are bayonet. I can get the two LED bulbs to work in that bedroom no problem. However, I use filament bulbs there because the LEDs I have are too bright for a bedroom. I'll have to wait for them (filament bulbs) to fail then fit lower wattage LEDs.
 
Tis a mystery. Does it matter which holder you put the LED lamps in when you use one LED and one filament lamp.
 
I swapped 2 bulbs between.2 identical fittings earlier this week... They both worked after they had been swapped, but only 1 before.

These were bayonet fittings!

Odd, but I put it down to crxp manufacturing standards of the bulbs.
 
Nope! I can put either one in either holder. The only criterion for them to work is that one of them must be filament. I know that this is an intractable problem and I have given it a lot of thought though I am not a Sparky (I was an engineer in a previous life). I think what I'll do is wait until I have my extension done in a few months time and get the electrician who does the wiring to check it all out and maybe re-wire. I suspect that ultimately we'll get it to work, but I'll probably never know the reason! If I do, then I'll post it. Thanks to all who have responded - I appreciate your time and thoughts.
 
LED is definitely a 240v? They're not connected in series are they and that is playing silly buggers with the LED?
 
Sorry to the last two responders. I posted before I had seen your queries. 60w is the equivalent. Sorry I should have made this clear. The actual wattage for each LED bulb is claimed to be 10W with an output of 810 lumens each. All LED bulbs tried in this circuit and have been tried in other circuits. All are faultless. Odd that Murdoch had a similar problem. I shall go through my stock of LED bulbs just to be sure, but since the ones that don't work in the study do work elsewhere gives me little hope that I will find this to solve it.
 
The LED is definitely a 240v it actually says 220-240v 50/60 Hz. They are connected in series, but then so are the ones in the kitchen and bedroom and they don't fight. However, it does feel as if they are in conflict though that is an emotion not a measurable fact!
 

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