Why can I not replace a light bulb? 4pin PLTs

[dmuk]

We have moved into a new property and most of the bulbs need replacing.

There is a mixture of different down and fluorescent lights. Each seems to have a different housing or fixture type. Why?

Anyway!

I am struggling with replacing the PLT 4 pin light bulbs (plt 18w 4000k 4-pin).

1) It was difficult to pull the old bulbs out.
2) It was difficult to push the new bulb into the socket.
3) Once in, it is now difficult to push the bulb all the way in. The housing moves around making it impossible to secure the bulb in place.
4) None of the new bulbs work. I believe it is because they are not fully inserted.

Can anyone provide some tips or advise on how to get these working?

 

[Steve]

If they are downlights, with hidden gear and lamp sockets, you might need to get to the back of the fitting to brace the back while you push the lamp right into it. They take a bit of force.

It depends on the fitting, but it might be fairly easy to pull the fitting out of the ceiling, but some have rear fixings. Some have a trim ring you pull off and the fitting unscrews around the edge.

I have a couple of PL fittings in the kitchen, but both are going black on the ends of the tubes, so I'm going to have to order some new lamps soon. Wonderfully bright still though.

 

[Lectrician]

Some PL lamps have a key on the side to prevent them being fitted into the socket - The correct lamp will fit

 

[dmuk]

Thanks for the response.

They are definitely the correct lamps. I know this because I have taken an older lamp and tried to insert it into the old socket and other two exact same sockets.

My challenge is lining up the lamp with the socket within the narrow lighting housing. When the lamp and socket make contact, the socket moves out of place.

This is why I am questioning whether there is a special technique in replacing these OR the socket/housing is damaged/broken?

Where is the best place to buy replacement lamps? Tescos, online or other?

 

[hammo2809]

Stay away from supermarkets and DIY stores if you looking to buy replacement bulbs such as these. I always use my local electrical wholesalers. Better quality of bulb and if there is a problem they have the expertise to advise.

 

[dmuk]

Thanks again for the replies.

I have tried a replacement lamp. Not working?

Now not sure if it is not inserted properly or transformer issue. How can I tell?

 

[pheonix]

Try this-

Identify an existing original lamp that works, switch off the power, let the lamp cool and try it in the fitting that is giving you problems.
If the lamp doesn't work after you switch on the power then the electronic ballast inside the fitting is shot.