Which company is the group recommended UK LED supplier these days

I used to use LED Hut but remember seeing on this group that maybe they
have new owners and now the service and delivery times are not good.

This time I'm after some white LED strip @ 10W per metre plus
heat-sink/channel and diffuser cover.

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Do they really get that warm? I thought the idea of LED was efficiency.
Brian

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"alan_m" wrote in message
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Which company is the group recommended UK LED supplier these days

I used to use LED Hut but remember seeing on this group that maybe they
have new owners and now the service and delivery times are not good.

This time I'm after some white LED strip @ 10W per metre plus
heat-sink/channel and diffuser cover.

--
mailto : news {at} admac {dot} myzen {dot} co {dot} uk

On Friday, 21 February 2020 07:55:18 UTC, Brian Gaff (Sofa) wrote:
Do they really get that warm? I thought the idea of LED was efficiency.
Brian

Yes they can get quite hot but the heat is very localised to the junction, so
you don't normally notice. Whenever current flows heat will be generated,
where there's resistance.


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"alan_m" wrote in message
...

Which company is the group recommended UK LED supplier these days

I used to use LED Hut but remember seeing on this group that maybe they
have new owners and now the service and delivery times are not good.

This time I'm after some white LED strip @ 10W per metre plus
heat-sink/channel and diffuser cover.

--
mailto : news {at} admac {dot} myzen {dot} co {dot} uk

On 21/02/2020 07:55, Brian Gaff (Sofa) wrote:
Do they really get that warm? I thought the idea of LED was efficiency.

10W per metre is the total power and in the case of LEDS most of which
is converted to light.

10W per metre strip may output 800 to 1000 lumens per metre.

The aluminium channel and diffuser is required for the ease of
installation for where I'm fitting the lighting. The aluminium channel
also has the advantage of providing some heat-sinking which may not
actually be required for operation.


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In article ,
Brian Gaff \(Sofa\) wrote:
Do they really get that warm? I thought the idea of LED was efficiency.
Brian

Very much so. The LEDs in my car headlights have cooling fans.

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

Well if its switched very fast and the resistance is low then its all down
to the duty cycle of the device. There was some work done some time ago over
running leds in pulse mode. I never heard the results.
Brian

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"whisky-dave" wrote in message
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On Friday, 21 February 2020 07:55:18 UTC, Brian Gaff (Sofa) wrote:
Do they really get that warm? I thought the idea of LED was efficiency.
Brian

Yes they can get quite hot but the heat is very localised to the junction,
so
you don't normally notice. Whenever current flows heat will be generated,
where there's resistance.


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The Sofa of Brian Gaff...

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"alan_m" wrote in message
...

Which company is the group recommended UK LED supplier these days

I used to use LED Hut but remember seeing on this group that maybe they
have new owners and now the service and delivery times are not good.

This time I'm after some white LED strip @ 10W per metre plus
heat-sink/channel and diffuser cover.

--
mailto : news {at} admac {dot} myzen {dot} co {dot} uk

Yes well in a very enclosed space, I can imagine that would be needed if
they are on long periods. Brian

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"Dave Plowman (News)" wrote in message
...
In article ,
Brian Gaff \(Sofa\) wrote:
Do they really get that warm? I thought the idea of LED was efficiency.
Brian

Very much so. The LEDs in my car headlights have cooling fans.

--
*Certain frogs can be frozen solid, then thawed, and survive *

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

On Friday, 21 February 2020 16:03:25 UTC, Brian Gaff (Sofa 2) wrote:
Well if its switched very fast and the resistance is low then its all down
to the duty cycle of the device. There was some work done some time ago over
running leds in pulse mode. I never heard the results.
Brian

Almost all LEDs are run in pulse mode more commonly know as PWM (pulse width modulation).
That's why some car headlights flash if you film them at high FPS rates,
I even notice it on the 7-seg displays on our PSUs, where it's more multi-plexing the display rather than PWM.

That si why you can hear a sound from cheap LED PSUs.

On Friday, 21 February 2020 11:37:12 UTC, alan_m wrote:

10W per metre is the total power and in the case of LEDS most of which
is converted to light.

they're quite good but not that good.

10W per metre strip may output 800 to 1000 lumens per metre.

80-100 per watt is well short of 50% efficiency.