Hi All,

We have had a couple of rooms worth of LED down lighters installed (12 in one room and 4 in the other)
(Both on MK dimmer switches).

Occasionally they flicker. I suspect this is either when the CH thermostat kicks in/out, or the fridge stat does the same.

Is this normal behaviour for this kind of lighting? Or does it indicate a fault?

TIA

Chris

On 13/04/18 12:00, Chris Hogg wrote:
On Fri, 13 Apr 2018 03:42:22 -0700 (PDT), wrote:

Hi All,

We have had a couple of rooms worth of LED down lighters installed (12 in one room and 4 in the other)
(Both on MK dimmer switches).

Occasionally they flicker. I suspect this is either when the CH thermostat kicks in/out, or the fridge stat does the same.

Is this normal behaviour for this kind of lighting? Or does it indicate a fault?

TIA

Chris

IME it's not uncommon, and is probably normal. When I had a single
phase 7kW electric pottery kiln the lights would flicker momentarily
when the power relay kicked in, and I've also noticed it with items
drawing much less current. I think the eye is quite sensitive to these
sorts of things.

I used to have this on my old house whenever the microwave kicked in,
but swappng the pole mounted transformer for a massive garden mounted
substation fixed it.

It is an indication of a high impedance supply.



--
Religion is regarded by the common people as true, by the wise as
foolish, and by the rulers as useful.

(Seneca the Younger, 65 AD)

Used to happen on a long run to my old shed when i could see, when the fan
heater cut in.
I'd have expected though that if these were led and fed from a stable
supply than this should be handled by the psu surely?

Brian

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"Chris Hogg" wrote in message
...
On Fri, 13 Apr 2018 03:42:22 -0700 (PDT), wrote:

Hi All,

We have had a couple of rooms worth of LED down lighters installed (12 in
one room and 4 in the other)
(Both on MK dimmer switches).

Occasionally they flicker. I suspect this is either when the CH thermostat
kicks in/out, or the fridge stat does the same.

Is this normal behaviour for this kind of lighting? Or does it indicate a
fault?

TIA

Chris

IME it's not uncommon, and is probably normal. When I had a single
phase 7kW electric pottery kiln the lights would flicker momentarily
when the power relay kicked in, and I've also noticed it with items
drawing much less current. I think the eye is quite sensitive to these
sorts of things.

--

Chris

Brian Gaff wrote:

Used to happen on a long run to my old shed when i could see, when the fan
heater cut in.
I'd have expected though that if these were led and fed from a stable
supply than this should be handled by the psu surely?

Brian

Apart from the fact that most LEDs are likely to have the cheapest
unregulated supply possible, we are told these are dimmable LEDs which
will be designed for variable brightness with supply voltage.


--

Roger Hayter

In article ,
Roger Hayter wrote:
Brian Gaff wrote:

Used to happen on a long run to my old shed when i could see, when the
fan heater cut in. I'd have expected though that if these were led and
fed from a stable supply than this should be handled by the psu surely?

Brian

Apart from the fact that most LEDs are likely to have the cheapest
unregulated supply possible, we are told these are dimmable LEDs which
will be designed for variable brightness with supply voltage.

I dunno just how dimmable LEDs actually work. But with a SMPS inside them,
may not actually react to voltage variation within its parameters.

--
*I'd kill for a Nobel Peace Prize *

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

On 13/04/2018 13:12, The Natural Philosopher wrote:
On 13/04/18 12:00, Chris Hogg wrote:
On Fri, 13 Apr 2018 03:42:22 -0700 (PDT), wrote:

Hi All,

We have had a couple of rooms worth of LED down lighters installed
(12 in one room and 4 in the other)
(Both on MK dimmer switches).

Occasionally they flicker. I suspect this is either when the CH
thermostat kicks in/out, or the fridge stat does the same.

Is this normal behaviour for this kind of lighting? Or does it
indicate a fault?

TIA

Chris

IME it's not uncommon, and is probably normal. When I had a single
phase 7kW electric pottery kiln the lights would flicker momentarily
when the power relay kicked in, and I've also noticed it with items
drawing much less current. I think the eye is quite sensitive to these
sorts of things.

I used to have this on my old house whenever the microwave kicked in,
but swappng the pole mounted transformer for a massive garden mounted
substation fixed it.

It is an indication of a high impedance supply.



But not in the OPs case. The CH or fridge is not a big enough load to
cause this behaviour.


--
Adam