Lighting question
 

In article ,
Steve Thackery wrote:
Alan wrote:

In my experience these higher power LEDs only have a working life of a
few thousand hours unless you can keep the semiconductor junction
temperature cool. The average light fitting will not allow them to run
cool.

But a few thousand hours is a long time, compared with the 1000 hours
of a typical tungsten lamp, and the oft-claimed but rarely achieved
8000 hours of a CFL.

There are 8760 hours in a year, so you're probably looking at - what,
eight years? - for a bulb lit for two hours per day in the summer and
six hours per day in the winter.

but, in a shop window displya, they may be on for 24 hours a day. 1000
hours is about 6 weeks - so a few thousand hours might be a year - if you
are lucky.

--
From KT24

Using a RISC OS computer running v5.16

Lighting question
 

On Sat, 9 Oct 2010 15:49:50 +0100, Ian Jackson
wrote:

I first started using CFLs four or five (?) years ago. Most of the
lights in the house (those which can be CFLs) are now CFLs. I've never
had to replace one.

I started using CFLs 1987 and some of them still working.

Lighting question
 

Ian Jackson wrote:
In message , Mark Carver
writes
Max Demian wrote:

You've got it the wrong way round. It's CFLs that contain mercury
(and if one blows up you are supposed to abandon the house and call
in a decontamination team).

Remind me how long fluorescent tubes have been in use domestically in
the UK ?

I first started using CFLs four or five (?) years ago. Most of the
lights in the house (those which can be CFLs) are now CFLs. I've never
had to replace one.

That's not answering my question Ian :-)

--
Mark
Please replace invalid and invalid with gmx and net to reply.

www.paras.org.uk

Lighting question
 

"Dave Plowfool" wrote in message
...
In article ,
j r powell wrote:

"Dave Plowman (News)" wrote in message
...

They're very picky who they let post. Jamie got his arse kicked after
his first post.

In your dreams, Plowfool.
(he's very bitter because I made a fool out of him).

Still in denial, pet?

You're the one in denial, Plowfool.

I sailed on the Nile last August though, which, given your low IQ, might be
close enough to make you feel inappropriately smug.

jamie.
--

Lighting question
 

On Sat, 09 Oct 2010 16:21:36 +0100, Mark Carver
wrote:

Ian Jackson wrote:
In message , Mark Carver
writes
Max Demian wrote:

You've got it the wrong way round. It's CFLs that contain mercury
(and if one blows up you are supposed to abandon the house and call
in a decontamination team).

Remind me how long fluorescent tubes have been in use domestically in
the UK ?

I first started using CFLs four or five (?) years ago. Most of the
lights in the house (those which can be CFLs) are now CFLs. I've never
had to replace one.

That's not answering my question Ian :-)

T depends what you mean by "domestically". When I bought this house in
1973 the garage was lit by fluorescent tubes (it still is). There was
nothing unusual about that.

Some people had fluorescent tubes in their kitchens at that time.

--
Peter Duncanson
(in uk.tech.digital-tv)

Lighting question
 

Peter Duncanson wrote:
On Sat, 09 Oct 2010 16:21:36 +0100, Mark Carver
wrote:

Ian Jackson wrote:
In message , Mark Carver
writes
Max Demian wrote:

You've got it the wrong way round. It's CFLs that contain mercury
(and if one blows up you are supposed to abandon the house and call
in a decontamination team).
Remind me how long fluorescent tubes have been in use domestically in
the UK ?

I first started using CFLs four or five (?) years ago. Most of the
lights in the house (those which can be CFLs) are now CFLs. I've never
had to replace one.
That's not answering my question Ian :-)

T depends what you mean by "domestically". When I bought this house in
1973 the garage was lit by fluorescent tubes (it still is). There was
nothing unusual about that.

Some people had fluorescent tubes in their kitchens at that time.

Indeed, my parents had them in use in their house from new in 1966, I'm too
young to remember their house before that. Anyway, I don't recall any safety
fears about broken tubes from the last century, it's all started up in recent
'nanny state' years, and CFLs are no more hazardous than good old fluorescent
tubes ?


--
Mark
Please replace invalid and invalid with gmx and net to reply.

www.paras.org.uk

Lighting question
 

In article ,
Mark Carver wrote:


Indeed, my parents had them in use in their house from new in 1966, I'm
too young to remember their house before that. Anyway, I don't recall
any safety fears about broken tubes from the last century, it's all
started up in recent 'nanny state' years, and CFLs are no more hazardous
than good old fluorescent tubes ?


I put a fluorescent fitting in the kitchen of our first house in 1964 and
they weren't particularly new at that time.

But I don't think it's all 'nanny state'. There were materials we used
like "Rawlplastic" (asbestos fibres) - for plugging screw holes in walls
-that nobody considered dangerous at the time. I can remember when BBC RD
had an open bath of mercury in one of the labs which was used as a variable
delay line.

--
From KT24

Using a RISC OS computer running v5.16

Lighting question
 

charles wrote:

but, in a shop window displya, they may be on for 24 hours a day. 1000
hours is about 6 weeks - so a few thousand hours might be a year - if you
are lucky.

Good point about the show window display. But of course that applies
to whatever type of light you are using. I understand a traditional
fluorescent tube will last around 20,000 hours if left on continuously.
Does that seem right?

My point was that a LED life of "a few thousand hours" is very
comparable with existing light sources such as CFL and fluorescents,
and somewhat better than tungsten.

SteveT

Lighting question
 

On Sat, 09 Oct 2010 11:19:36 +0100, Ian Jackson wrote:

As the Americans might say "CFL sucks"

Because in the CFL they always punt on the 3rd down? ;)

Lighting question
 

"Alan" wrote in message
...
In message , Steve Terry
wrote

You'll be binning them soon when LED bulbs get cheaper,
CFL bulbs are a dead technology.

LED Such as:
http://www.dealextreme.com/details.dx/sku.37161

In my experience these higher power LEDs only have a working life of a few
thousand hours unless you can keep the semiconductor junction temperature
cool. The average light fitting will not allow them to run cool.
Alan


But it's very early days, give it ten years LED's be refined and cheap

Steve Terry
--
"I would like to plead for my right to investigate natural phenomena
without having guns pointed at me.
I also ask for the right to be wrong without being hanged for it."
- Wilhelm Reich, November 1947