Low Voltage Downlight Problems, Please Help

[catfish5]

Bought 6 of these for my bathroom

http://cgi.ebay.co.uk/IP54-CHROME-1...9431545QQihZ017QQcategoryZ29510QQcmdZViewItem

Got 6 transformers from the electrician at my work, have them fitted to a dimmer switch and used 20w bulbs rather than the 50w one's that were supplied.

Initially for the first 4 days i used the 50w bulbs before purchasing the 20w one's, during this period they worked with no problems.

When i changed them to the 20w one's this is when it all went wrong, most of the lights flickered, then 5 of them never worked. I tested the bulbs and they worked ok, and when i moved the transformer of the working lamp to one of the faulty one's it worked ok, conclusion, faulty transformers! Spoke to my work collegue who gave me 5 new one's. I changed them over and bingo, 6 working lights!

Great, or so i thought, about 2 hrs later i dimmed them, then turned them back up full, flicker flicker, 3 out!!!

What is the problem?

Is it the lamps? Is it just unlucky transformers?

The transformers were two different makes, both state they are dimmable!

Please help, i don't want to ask my collegue again, he's a busy guy and i don't want to be a pest.

Thanks

 

[breezer]

may be the transformers have a min 35 watt load

 

[catfish5]

Just checked and they are 12 - 60 va

 

[jj4091]

If you put the 50W lamps back in & they are ok it will prove Breezers suspicion, despite what the label says.

 

[Albert]

If this is the case and you do not want 50W you still can use 35W ones.
Is the dimmer the correct one?

 

[catfish5]

Have bought the most expensive transformers i could get (£8.50 each) after getting a bit of advice from an old head, this has solved the problem, he recons dimmer switches are the root of all evil!

Thanks to all