I have a LED lamp, I suspect the PSU (which is at the plug) has packed in.

Can I just snip it off and use one of the numerous similar rated wall
warts I have knocking about or do they need something specific?

On 12/07/2018 09:19, R D S wrote:
I have a LED lamp, I suspect the PSU (which is at the plug) has packed in.

Can I just snip it off and use one of the numerous similar rated wall
warts I have knocking about or do they need something specific?


If it says what it supplies, then just use something with the same
voltage and at least the same current.

Cheers
--
Clive

On 12/07/2018 09:19, R D S wrote:
I have a LED lamp, I suspect the PSU (which is at the plug) has packed in.

Can I just snip it off and use one of the numerous similar rated wall
warts I have knocking about or do they need something specific?


Depends. It may want a constant voltage or constant current supply.
What's the make/model? Failing that, does it have a user-replaceable
"bulb" and if so of what sort?

--
Robin
reply-to address is (intended to be) valid

On Thursday, 12 July 2018 09:19:30 UTC+1, R D S wrote:

I have a LED lamp, I suspect the PSU (which is at the plug) has packed in.

Can I just snip it off and use one of the numerous similar rated wall
warts I have knocking about or do they need something specific?

LEDs are driven constant current, warts are mostly constant voltage. But it is more complex than that of course. What _exactly_ are the wart's output specs? What voltage does a multimeter say it's giving?


NT

So if you know the rating of the one that was supplied by implication any
other should do the job. as always, voltage, polarity current drain and
starting drain are the most important aspects to consider.
Brian

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"R D S" wrote in message
news
I have a LED lamp, I suspect the PSU (which is at the plug) has packed in.

Can I just snip it off and use one of the numerous similar rated wall
warts I have knocking about or do they need something specific?

Bit late if its popped its cloggs. Actually I've noticed some lamps sold as
task lights have an Led lamp which has a constant current drive in it and
has a nominal input voltage of 5 volts at quite a fair current.
I imagine very much it depends on the bulb and where the constant current
bit is.
Its a little odd to find a wall wart permanently connected if its just a
standard one so I'd be a little wary myself.
Brian

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This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please
Note this Signature is meaningless.!
wrote in message
...
On Thursday, 12 July 2018 09:19:30 UTC+1, R D S wrote:

I have a LED lamp, I suspect the PSU (which is at the plug) has packed
in.

Can I just snip it off and use one of the numerous similar rated wall
warts I have knocking about or do they need something specific?

LEDs are driven constant current, warts are mostly constant voltage. But
it is more complex than that of course. What _exactly_ are the wart's
output specs? What voltage does a multimeter say it's giving?


NT

On Thursday, 12 July 2018 10:53:33 UTC+1, Brian Gaff wrote:
"R D S" wrote in message
news
I have a LED lamp, I suspect the PSU (which is at the plug) has packed in.

Can I just snip it off and use one of the numerous similar rated wall
warts I have knocking about or do they need something specific?



So if you know the rating of the one that was supplied by implication any
other should do the job.


nope

as always, voltage, polarity current drain and
starting drain are the most important aspects to consider.
Brian

nope


NT

On Thursday, 12 July 2018 10:57:18 UTC+1, Brian Gaff wrote:
tabbypurr wrote in message
...
On Thursday, 12 July 2018 09:19:30 UTC+1, R D S wrote:

I have a LED lamp, I suspect the PSU (which is at the plug) has packed
in.

Can I just snip it off and use one of the numerous similar rated wall
warts I have knocking about or do they need something specific?

LEDs are driven constant current, warts are mostly constant voltage. But
it is more complex than that of course. What _exactly_ are the wart's
output specs? What voltage does a multimeter say it's giving?


NT

Bit late if its popped its cloggs.

nope


Actually I've noticed some lamps sold as
task lights have an Led lamp which has a constant current drive in it and
has a nominal input voltage of 5 volts at quite a fair current.
I imagine very much it depends on the bulb and where the constant current
bit is.

you imagine correctly for once

Its a little odd to find a wall wart permanently connected if its just a
standard one so I'd be a little wary myself.
Brian

On 12/07/18 10:29, wrote:
On Thursday, 12 July 2018 09:19:30 UTC+1, R D S wrote:

I have a LED lamp, I suspect the PSU (which is at the plug) has packed in.

Can I just snip it off and use one of the numerous similar rated wall
warts I have knocking about or do they need something specific?

LEDs are driven constant current, warts are mostly constant voltage. But it is more complex than that of course. What _exactly_ are the wart's output specs? What voltage does a multimeter say it's giving?

There's no power coming out of it.

It's a Lidl uplighter, wart spec OP 24v 1.5a CV SELV

On 12/07/2018 14:10, R D S wrote:
OP 24v 1.5a CV SELV

ISTM that's CV as in "constant voltage" (as opposed to CC as in
"constant current").

--
Robin
reply-to address is (intended to be) valid

In article ,
R D S wrote:
I have a LED lamp, I suspect the PSU (which is at the plug) has packed in.

Can I just snip it off and use one of the numerous similar rated wall
warts I have knocking about or do they need something specific?

I'd say the answer is maybe. If it uses a standard PS - ie just plain AC
or DC - then probably a similar one will be OK, as the LED driver
electronics will be inside the fitting. But if it uses a wall wart with
the driver built into that, you'd need a similar replacement.

--
*I used to be a banker, but then I lost interest.*

Dave Plowman London SW
To e-mail, change noise into sound.

On 12/07/2018 14:10, R D S wrote:
On 12/07/18 10:29, wrote:
On Thursday, 12 July 2018 09:19:30 UTC+1, R D SÂ* wrote:

I have a LED lamp, I suspect the PSU (which is at the plug) has
packed in.

Can I just snip it off and use one of the numerous similar rated wall
warts I have knocking about or do they need something specific?

LEDs are driven constant current, warts are mostly constant voltage.
But it is more complex than that of course. What _exactly_ are the
wart's output specs? What voltage does a multimeter say it's giving?

There's no power coming out of it.

It's a Lidl uplighter, wart spec OP 24v 1.5a CV SELV



So you want a regulated 24v @ 1.5A power supply.
SELV implies it needs to be isolated which some cheap chinese
switchmodes aren't.

http://cpc.farnell.com/stontronics/t...6?st=24v%20psu
but it doesn't say selv but its class II.

On 12/07/2018 14:41, Robin wrote:
On 12/07/2018 14:10, R D S wrote:
OP 24v 1.5a CV SELV

ISTM that's CV as in "constant voltage" (as opposed to CC as in
"constant current").


I would agree with that.

It's not going to be easy to find another plug in version.

--
Adam

"R D S" wrote in message
news
On 12/07/18 10:29, wrote:
On Thursday, 12 July 2018 09:19:30 UTC+1, R D S wrote:

I have a LED lamp, I suspect the PSU (which is at the plug) has packed
in.

Can I just snip it off and use one of the numerous similar rated wall
warts I have knocking about or do they need something specific?

LEDs are driven constant current, warts are mostly constant voltage. But
it is more complex than that of course. What _exactly_ are the wart's
output specs? What voltage does a multimeter say it's giving?

There's no power coming out of it.

It's a Lidl uplighter, wart spec OP 24v 1.5a CV SELV

CV means constant voltage, as opposed to constant current.

The SELV can be ignored when selecting a replacement.

R D S wrote:

I have a LED lamp, I suspect the PSU (which is at the plug) has packed in.

Can I just snip it off and use one of the numerous similar rated wall
warts I have knocking about or do they need something specific?

IMO they are so cheap that I'd try one and see if it works fine.