In article ,
ARW wrote:
On 24/01/2017 12:00, ARW wrote:
On 23/01/2017 20:04, Andy Burns wrote:
ARW wrote:

just about to fit Scolmore dimmers at a property I am working at.

Which models? Looking at two or three of their brochures the phrase
that keeps cropping up is "largely for use with Tungsten, Halogen and
Low Voltage lamps"

Also the 10 or 20 year warranty includes the wriggle-words "Electronic
Parts 1 Year" which isn't very re-assuring for a dimmer.

I'll let you know

Sory for the delay, I have been elsewhere this week.

They are the Scolmore/Click MD150 range used with their OVIA 5.5W GU10
LEDs. Now their tech department said they would dim to 25% as long as at
least two lamps were fitted and the total load was not exceeded.
This has turned out to be correct and so I just order 177 dimmable lamps!

Wonder why it's taken so long to make LEDs which dimmed with a normal
dimmer? To force people to buy new ones - since they have such a claimed
long life?

--
*A chicken crossing the road is poultry in motion.*

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

"Dave Plowman (News)" wrote in message
...
In article ,
ARW wrote:
On 24/01/2017 12:00, ARW wrote:
On 23/01/2017 20:04, Andy Burns wrote:
ARW wrote:

just about to fit Scolmore dimmers at a property I am working at.

Which models? Looking at two or three of their brochures the phrase
that keeps cropping up is "largely for use with Tungsten, Halogen and
Low Voltage lamps"

Also the 10 or 20 year warranty includes the wriggle-words "Electronic
Parts 1 Year" which isn't very re-assuring for a dimmer.

I'll let you know

Sory for the delay, I have been elsewhere this week.

They are the Scolmore/Click MD150 range used with their OVIA 5.5W GU10
LEDs. Now their tech department said they would dim to 25% as long as at
least two lamps were fitted and the total load was not exceeded.
This has turned out to be correct and so I just order 177 dimmable lamps!

Wonder why it's taken so long to make LEDs
which dimmed with a normal dimmer?

Because its not as easy or cheap to do.

To force people to buy new ones

Usual utterly mindless conspiracy theory.

- since they have such a claimed long life?

On Sunday, 5 February 2017 11:03:43 UTC, Dave Plowman (News) wrote:
In article ,
ARW wrote:
On 24/01/2017 12:00, ARW wrote:
On 23/01/2017 20:04, Andy Burns wrote:
ARW wrote:

just about to fit Scolmore dimmers at a property I am working at.

Which models? Looking at two or three of their brochures the phrase
that keeps cropping up is "largely for use with Tungsten, Halogen and
Low Voltage lamps"

Also the 10 or 20 year warranty includes the wriggle-words "Electronic
Parts 1 Year" which isn't very re-assuring for a dimmer.

I'll let you know

Sory for the delay, I have been elsewhere this week.

They are the Scolmore/Click MD150 range used with their OVIA 5.5W GU10
LEDs. Now their tech department said they would dim to 25% as long as at
least two lamps were fitted and the total load was not exceeded.
This has turned out to be correct and so I just order 177 dimmable lamps!

Wonder why it's taken so long to make LEDs which dimmed with a normal
dimmer? To force people to buy new ones - since they have such a claimed
long life?

yuo';d have to know how LEDs work in that there is an off time
fropm 0 to about 1.2V then they are fully on at about 2V
which doesn't leave much wiggle room for dimming.
This is one of our skills labs the studetns use a pot to dim an LED.

In article ,
whisky-dave wrote:
yuo';d have to know how LEDs work in that there is an off time
fropm 0 to about 1.2V then they are fully on at about 2V
which doesn't leave much wiggle room for dimming.
This is one of our skills labs the studetns use a pot to dim an LED.

An LED driven from DC via a suitable pot dims nicely. Once triggered. It
may not start up on the lowest setting, though.

--
*The average person falls asleep in seven minutes *

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

On Monday, 6 February 2017 11:32:12 UTC, Dave Plowman (News) wrote:
In article ,
whisky-dave wrote:
yuo';d have to know how LEDs work in that there is an off time
fropm 0 to about 1.2V then they are fully on at about 2V
which doesn't leave much wiggle room for dimming.
This is one of our skills labs the studetns use a pot to dim an LED.

An LED driven from DC via a suitable pot dims nicely. Once triggered.

There you go, you have to wait until it's triggered so 50% of the rise time it's untriggered, doesnlt leave much as much for dimming.

You should also note that mains lighting isn't DC for most of us and that yuo can;t use a simple pot because of this.
with 'AC" it's also easier to switch an LED off than switch it on because you don't have to worry about the trigger point, just switch it on then wait a while and switch it off, and that is why it costs a bit more and a bit more complex.


It
may not start up on the lowest setting, though.

unless dimmed properly.

In article ,
whisky-dave wrote:
On Monday, 6 February 2017 11:32:12 UTC, Dave Plowman (News) wrote:
In article ,
whisky-dave wrote:
yuo';d have to know how LEDs work in that there is an off time fropm
0 to about 1.2V then they are fully on at about 2V which doesn't
leave much wiggle room for dimming. This is one of our skills labs
the studetns use a pot to dim an LED.

An LED driven from DC via a suitable pot dims nicely. Once triggered.

There you go, you have to wait until it's triggered so 50% of the rise
time it's untriggered, doesnlt leave much as much for dimming.

You should also note that mains lighting isn't DC for most of us and that
yuo can;t use a simple pot because of this. with 'AC" it's also easier
to switch an LED off than switch it on because you don't have to worry
about the trigger point, just switch it on then wait a while and switch
it off, and that is why it costs a bit more and a bit more complex.


It may not start up on the lowest setting, though.

unless dimmed properly.

It's certainly dome with theatre lights

--
from KT24 in Surrey, England

On Monday, 6 February 2017 12:36:41 UTC, charles wrote:
In article ,
whisky-dave wrote:
On Monday, 6 February 2017 11:32:12 UTC, Dave Plowman (News) wrote:
In article ,
whisky-dave wrote:
yuo';d have to know how LEDs work in that there is an off time fropm
0 to about 1.2V then they are fully on at about 2V which doesn't
leave much wiggle room for dimming. This is one of our skills labs
the studetns use a pot to dim an LED.

An LED driven from DC via a suitable pot dims nicely. Once triggered.

There you go, you have to wait until it's triggered so 50% of the rise
time it's untriggered, doesnlt leave much as much for dimming.

You should also note that mains lighting isn't DC for most of us and that
yuo can;t use a simple pot because of this. with 'AC" it's also easier
to switch an LED off than switch it on because you don't have to worry
about the trigger point, just switch it on then wait a while and switch
it off, and that is why it costs a bit more and a bit more complex.


It may not start up on the lowest setting, though.

unless dimmed properly.

It's certainly dome with theatre lights

and how much is a theatre dimmer compaired to a dimmer you'd use in the home ?

I know theatre have curtain closing too but you don't ofent see them in the average home.



--
from KT24 in Surrey, England

In article ,
whisky-dave wrote:
On Monday, 6 February 2017 12:36:41 UTC, charles wrote:
In article ,
whisky-dave wrote:
On Monday, 6 February 2017 11:32:12 UTC, Dave Plowman (News) wrote:
In article ,
whisky-dave wrote:
yuo';d have to know how LEDs work in that there is an off time
fropm 0 to about 1.2V then they are fully on at about 2V which
doesn't leave much wiggle room for dimming. This is one of our
skills labs the studetns use a pot to dim an LED.

An LED driven from DC via a suitable pot dims nicely. Once
triggered.

There you go, you have to wait until it's triggered so 50% of the
rise time it's untriggered, doesnlt leave much as much for dimming.

You should also note that mains lighting isn't DC for most of us and
that yuo can;t use a simple pot because of this. with 'AC" it's also
easier to switch an LED off than switch it on because you don't have
to worry about the trigger point, just switch it on then wait a while
and switch it off, and that is why it costs a bit more and a bit more
complex.


It may not start up on the lowest setting, though.

unless dimmed properly.

It's certainly dome with theatre lights

and how much is a theatre dimmer compaired to a dimmer you'd use in the
home ?


The lights have their own built in dimmer

I know theatre have curtain closing too but you don't ofent see them in
the average home.


but you can buy them - with dawn/dusk sensors too.

--
from KT24 in Surrey, England

In article ,
whisky-dave wrote:
On Monday, 6 February 2017 11:32:12 UTC, Dave Plowman (News) wrote:
In article ,
whisky-dave wrote:
yuo';d have to know how LEDs work in that there is an off time
fropm 0 to about 1.2V then they are fully on at about 2V
which doesn't leave much wiggle room for dimming.
This is one of our skills labs the studetns use a pot to dim an LED.

An LED driven from DC via a suitable pot dims nicely. Once triggered.

There you go, you have to wait until it's triggered so 50% of the rise
time it's untriggered, doesnlt leave much as much for dimming.

Leaves plenty to dim it from an on state.

You should also note that mains lighting isn't DC for most of us and
that yuo can;t use a simple pot because of this.

No ****, Sherlock?

with 'AC" it's also easier to switch an LED off than switch it on
because you don't have to worry about the trigger point, just switch it
on then wait a while and switch it off, and that is why it costs a bit
more and a bit more complex.

Eh?


It
may not start up on the lowest setting, though.

unless dimmed properly.

Are you wanting to discuss dimming a low voltage DC driven LED or one on
AC mains?

--
*Taxation WITH representation ain't much fun, either.

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

In article ,
charles wrote:
It may not start up on the lowest setting, though.

unless dimmed properly.

It's certainly dome with theatre lights

The pro dimmers used on portable film LED lighting I've seen are PWM. This
allows a good fade up and fade down. But then they didn't used LEDs
designed as a replacement for ordinary tungsten mains lamps.

--
*One tequila, two tequila, three tequila, floor.

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

On Monday, 6 February 2017 14:29:28 UTC, Dave Plowman (News) wrote:
In article ,
whisky-dave wrote:
On Monday, 6 February 2017 11:32:12 UTC, Dave Plowman (News) wrote:
In article ,
whisky-dave wrote:
yuo';d have to know how LEDs work in that there is an off time
fropm 0 to about 1.2V then they are fully on at about 2V
which doesn't leave much wiggle room for dimming.
This is one of our skills labs the studetns use a pot to dim an LED.

An LED driven from DC via a suitable pot dims nicely. Once triggered.

There you go, you have to wait until it's triggered so 50% of the rise
time it's untriggered, doesnlt leave much as much for dimming.

Leaves plenty to dim it from an on state.

exactly thats why they start dimming from an on state rarther than an off state like leading edge dimmers do.


You should also note that mains lighting isn't DC for most of us and
that yuo can;t use a simple pot because of this.

No ****, Sherlock?

Apparenty although the last time I was at a theartre they were using rhosstates for dimming lights 25+ years ago so I think they were just in series with the mains.


with 'AC" it's also easier to switch an LED off than switch it on
because you don't have to worry about the trigger point, just switch it
on then wait a while and switch it off, and that is why it costs a bit
more and a bit more complex.

Eh?

yeah Eh dimming using a trailing edge is more difficult/expensive than a leading edge.


It
may not start up on the lowest setting, though.

unless dimmed properly.

Are you wanting to discuss dimming a low voltage DC driven LED or one on
AC mains?

Both.
Why not.


--
*Taxation WITH representation ain't much fun, either.

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

In article ,
whisky-dave wrote:
On Monday, 6 February 2017 14:29:28 UTC, Dave Plowman (News) wrote:
In article ,
whisky-dave wrote:
On Monday, 6 February 2017 11:32:12 UTC, Dave Plowman (News) wrote:
In article ,
whisky-dave wrote:
yuo';d have to know how LEDs work in that there is an off time
fropm 0 to about 1.2V then they are fully on at about 2V which
doesn't leave much wiggle room for dimming. This is one of our
skills labs the studetns use a pot to dim an LED.

An LED driven from DC via a suitable pot dims nicely. Once
triggered.

There you go, you have to wait until it's triggered so 50% of the
rise time it's untriggered, doesnlt leave much as much for dimming.

Leaves plenty to dim it from an on state.

exactly thats why they start dimming from an on state rarther than an off
state like leading edge dimmers do.


You should also note that mains lighting isn't DC for most of us and
that yuo can;t use a simple pot because of this.

No ****, Sherlock?

Apparenty although the last time I was at a theartre they were using
rhosstates for dimming lights 25+ years ago so I think they were just in
series with the mains.

Rheostats (in series with the mains) ceased being mainstream for theatre
use around 60 years ago. I certainly met a remote controlled lighting
system in 1959.

--
from KT24 in Surrey, England

On Monday, 6 February 2017 12:26:15 UTC, whisky-dave wrote:
On Monday, 6 February 2017 11:32:12 UTC, Dave Plowman (News) wrote:
In article ,
whisky-dave wrote:
yuo';d have to know how LEDs work in that there is an off time
fropm 0 to about 1.2V then they are fully on at about 2V
which doesn't leave much wiggle room for dimming.
This is one of our skills labs the studetns use a pot to dim an LED.

An LED driven from DC via a suitable pot dims nicely. Once triggered.

There you go, you have to wait until it's triggered so 50% of the rise time it's untriggered, doesnlt leave much as much for dimming.

You should also note that mains lighting isn't DC for most of us and that yuo can;t use a simple pot because of this.
with 'AC" it's also easier to switch an LED off than switch it on because you don't have to worry about the trigger point, just switch it on then wait a while and switch it off, and that is why it costs a bit more and a bit more complex.


It
may not start up on the lowest setting, though.

unless dimmed properly.

God you talk some rubbish.

On Monday, 6 February 2017 15:25:17 UTC, wrote:
On Monday, 6 February 2017 12:26:15 UTC, whisky-dave wrote:
On Monday, 6 February 2017 11:32:12 UTC, Dave Plowman (News) wrote:
In article ,
whisky-dave wrote:
yuo';d have to know how LEDs work in that there is an off time
fropm 0 to about 1.2V then they are fully on at about 2V
which doesn't leave much wiggle room for dimming.
This is one of our skills labs the studetns use a pot to dim an LED.

An LED driven from DC via a suitable pot dims nicely. Once triggered.

There you go, you have to wait until it's triggered so 50% of the rise time it's untriggered, doesnlt leave much as much for dimming.

You should also note that mains lighting isn't DC for most of us and that yuo can;t use a simple pot because of this.
with 'AC" it's also easier to switch an LED off than switch it on because you don't have to worry about the trigger point, just switch it on then wait a while and switch it off, and that is why it costs a bit more and a bit more complex.


It
may not start up on the lowest setting, though.

unless dimmed properly.

God you talk some rubbish.

There's many ways to dim an LED some work better than others.