New LED lamp problem

[sidekick]

Hi All,

Earlyer this year I installed x 20 downlights and in order to save customer a small fortune in electricity bills have fitted LED lamps.
These lamps were installed stating 11,000 hours life (approx). Looked good and customer happy.
However, we are now 10 months down the line and to date I have had to go back and exchange x 8 of the lamps which have blown.
All have not blown at the same time, following the first couple of months problem free we now have one (different fitting each time) blowing approx every 3 to 4 weeks.
Given the level of failures the supplier has agreed to refund the lot but is not convinced the lamps were faulty and suspects surges or inconsistent supply in the circuitry.
Can anyone shed any light on possible causes and ofcourse any possible soloutions.

Totaly baff-led

 

[maffa ent]

the manufacturers are now starting to state, eg, "3 year guarantee" rather than "100's hours lamp life".

any that i've fitted, and only from trusted suppliers, i've had exchanged f.o.c..

it's a ballavhe having to change em, but hopefully mine was a bad batch, rather than anything more serious!

 

[davelerave]

gu10?
are the replacements same lamp and are they now blowing?

 

[Richard Burns]

Are they on dimmer switches?

 

[DurhamSparky]

what make so i can avoid!!!

 

[Amp David]

what make so i can avoid!!!

Yeah me too!!!

 

[sedgy34]

Led lamps carry a warranty you should be able to change them free of charge but the time spent on labour! (bummer)

 

[Brightspark2]

Sounds like cheap lamps...

You need to get better ones in or you'll be forever going back changing them...

Sent from my Xperia S using next doors WIFI.

 

[Guest111]

If you want to test one why not set one up at home and leave it on to see how long it lasts?As regards power issues you would have to leave a power quality device connected for a few days to check for surges etc,but they are not cheap kit.

 

[Deleted member 9648]

I've used a number of 'reasonably priced' GU10 led's from various manufacturers, and none have lasted anywhere near the stated life....personally I think the technology still has some way to go unless you spend out on real quality lamps.

 

[sidekick]

gu10?
are the replacements same lamp and are they now blowing?

keep getting replacement LED's from supplier but as yet same fitting not blown again.

- - - Updated - - -

Are they on dimmer switches?

Yes . All on dimmers but supplier and packaging clearly states dimmable?

 

[Richard Burns]

keep getting replacement LED's from supplier but as yet same fitting not blown again.
Yes . All on dimmers but supplier and packaging clearly states dimmable?

If you are using dimmer switches then the type of dimmer switch is critical to the lamp life, if you use a standard dimmer then this can cause problems.
The dimmer should (in most cases) be a trailing edge dimmer for LED lamps and capable of running on low load, most standard dimmers have problems below 40W and if you have say 40W of lamps then the dimmer may be providing an inconstant supply and causing failures. Also cheaper Dimmable LEDs are not very happy about being dimmed!

This is only one possible option but worth looking at.

 

[sidekick]

If you are using dimmer switches then the type of dimmer switch is critical to the lamp life, if you use a standard dimmer then this can cause problems.
The dimmer should (in most cases) be a trailing edge dimmer for LED lamps and capable of running on low load, most standard dimmers have problems below 40W and if you have say 40W of lamps then the dimmer may be providing an inconstant supply and causing failures. Also cheaper Dimmable LEDs are not very happy about being dimmed!

This is only one possible option but worth looking at.

Thanks for that sounds useful.
Supplier now agreed to take back complete lot for refund and have fitted fusion brand. So with a new 12 month guarentee will see what happens and if continue to fail will go down the dimmer check route.

 

[sedgy34]

Good to see guarantee. Being honoured