GU10 bulbs. Oversized locating dimple between pins?

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Just over a year ago, I bought these GU10 downlights for our bathroom.

http://www.mygreenlighting.co.uk/low_energy_downlights/led_downlights_ip65/1208.html

The bulbs seem to be TP24 2886.

http://www2.tp24.com/home/index.php/lamps/led/l1-led-3w-lamp-long-neck-2886.html

Three of the four bulbs have now gone, with not particularly high use. ~700 hours. 20,000 hours, my arse :( I have a couple of replacement Diall GU10 bulbs from B&Q, but they don't seem to fit in the mount?!? The TP24 bulb and downlight seems to have a larger dimple in the middle of the two pins which the Diall bulb doesn't have. I guess there are more types of GU10 bulb than I thought? Any ideas which GU10 bulbs might fit these downlights?


 
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I have had same problem and there does not seem to be more than the two types GU10 and GZ10 but there seems to be some holders which will not take the bulbs. In my case it was the taper of the reflector which caused the problem. My daughter took my cold cathode bulbs and they fitted her lamps without a problem.

I have also experienced the short life thing. Bought expensive Philips bulbs 8W CFU and within a year they had started to fail. Replaced with cheap 8W CFU and one one has gone. I think all down to luck.
 
Surely if they fail so soon you can take them back as rejects under the sale of goods act.
 
"20,000 hour life" means that by 20,000 hours half of them will have failed.

You'd never be able to get a statistically significant sample to show that the figure was wrong.

It's something to bear in mind if you're using LED lighting to save money overall, and your calculations are based on a long life.
 
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It's a con by the fitting manufacturer, so that you have to buy replacements from them only. Just like the 3 pin bayonet fittings by MEM.
 
Thank you BAS never realised they existed.
L1 bulbs have the same electrical connector as GU10 bulbs, but are only used on low energy bulbs.

The difference is that there is a hole in the center of the bulb between the pins. This is for a non electric pin in the lamp holder to slot into. The extra pin in an L1 lamp holder prevents the use of inefficient halogen lamps while allowing the use of L1 bulbs in GU10 lamp holders.

They are often found in newer houses built when building regulations required the use of dedicated low energy bulbs and in all light fittings from tp24.
 
It is a pity the GU5.3 holder does not have a similar system stopping lamps which are either too big or two small of a wattage for the transformer being used.

Must remember always to use GZ10 not L1 holders so it will take all types. Unless buried in wall or ceiling than GU10 to stop Dichroic lamps being used.

I can see the point in using L1 where heat would be a problem but other wise rather a pain having to get correct bulb.
 
The point is that unless you want to argue the toss with an unimaginative BCO, you have to have a number of light fittings in new builds and extensions which cannot take low-efficiency lamps.
 

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