It only lasted 2 1/2 years..:-)

In the usptairs corridor that is used daily, and has no windows...


For those of you who would also like a 70p bulb that lasts two and a
half years (minimum) its part number is NL258M

38 degree wide angle dichroic and quoted at 2000 hour minimum life.

Run of newey and eyre toroids that have some form of thermistor soft
start I think.

Hmm. At 2000 hours I make that 2.2 hours a day for 2.5 years. Sounds
about right actually. I'd say I've had em on more like 4 hours a day
average...

Let's see 2000 times 50W is 100 Kw/h. So its probably burnt about 6
quids worth of electricity in its lifetime. I think per light they cost
ten quid or so - fitting and transformer.

Well for an incandescent, this has to be the cheapest light ever.

Ok, not up with compact fluoros - or is it? How much capital cost in THEM?

Ok, not up with compact fluoros - or is it? How much capital cost in THEM?

Say 80p for a pendant fitting and 4 pounds for the bulb. It will have used
only 20kW/h. So the total cost over the same period would have been 4.80
capital and 1.20 in energy. It will also continue to operate for another
8000h.

Therefore, a CFL would have about half the capital cost and a fifth of the
running costs. Bulb replacement costs will be similar over a long period.

Christian.

Christian McArdle wrote:

Ok, not up with compact fluoros - or is it? How much capital cost in THEM?


Say 80p for a pendant fitting and 4 pounds for the bulb. It will have used
only 20kW/h. So the total cost over the same period would have been 4.80
capital and 1.20 in energy. It will also continue to operate for another
8000h.

Therefore, a CFL would have about half the capital cost and a fifth of the
running costs. Bulb replacement costs will be similar over a long period.


Yup. About what I suspected. Shame they all look crap really...

Christian.

The Natural Philosopher wrote:
It only lasted 2 1/2 years..:-)

In the usptairs corridor that is used daily, and has no windows...


For those of you who would also like a 70p bulb that lasts two and a
half years (minimum) its part number is NL258M

38 degree wide angle dichroic and quoted at 2000 hour minimum life.

Run of newey and eyre toroids that have some form of thermistor soft
start I think.

Hmm. At 2000 hours I make that 2.2 hours a day for 2.5 years. Sounds
about right actually. I'd say I've had em on more like 4 hours a day
average...

Let's see 2000 times 50W is 100 Kw/h. So its probably burnt about 6
quids worth of electricity in its lifetime. I think per light they cost
ten quid or so - fitting and transformer.

Well for an incandescent, this has to be the cheapest light ever.

But a sample of one is hardly enough to base a buying spree on is it?

--
Chris Green

On Thu, 27 Jan 2005 13:13:55 +0000, The Natural Philosopher
wrote:

It only lasted 2 1/2 years..:-)

In the usptairs corridor that is used daily, and has no windows...


For those of you who would also like a 70p bulb that lasts two and a
half years (minimum) its part number is NL258M

38 degree wide angle dichroic and quoted at 2000 hour minimum life.

Run of newey and eyre toroids that have some form of thermistor soft
start I think.

Hmm. At 2000 hours I make that 2.2 hours a day for 2.5 years. Sounds
about right actually. I'd say I've had em on more like 4 hours a day
average...

Let's see 2000 times 50W is 100 Kw/h. So its probably burnt about 6
quids worth of electricity in its lifetime. I think per light they cost
ten quid or so - fitting and transformer.

Hi,

If you have had them on for 4h/day that's more like 3650 hours, so
maybe 10 or 11 quid.

Well for an incandescent, this has to be the cheapest light ever.

Ok, not up with compact fluoros - or is it? How much capital cost in THEM?

About 2 quid.

cheers,
Pete.

wrote:

The Natural Philosopher wrote:

It only lasted 2 1/2 years..:-)

In the usptairs corridor that is used daily, and has no windows...


For those of you who would also like a 70p bulb that lasts two and a
half years (minimum) its part number is NL258M

38 degree wide angle dichroic and quoted at 2000 hour minimum life.

Run of newey and eyre toroids that have some form of thermistor soft
start I think.

Hmm. At 2000 hours I make that 2.2 hours a day for 2.5 years. Sounds
about right actually. I'd say I've had em on more like 4 hours a day
average...

Let's see 2000 times 50W is 100 Kw/h. So its probably burnt about 6
quids worth of electricity in its lifetime. I think per light they cost
ten quid or so - fitting and transformer.

Well for an incandescent, this has to be the cheapest light ever.


But a sample of one is hardly enough to base a buying spree on is it?


Well, lets put it this way, none of the other 15 have gone yet......so a
smaple of 16 ain't bad.

"Christian McArdle" wrote in message
. net...
Ok, not up with compact fluoros - or is it? How much capital cost in
THEM?

Say 80p for a pendant fitting and 4 pounds for the bulb. It will have used
only 20kW/h. So the total cost over the same period would have been 4.80
capital and 1.20 in energy. It will also continue to operate for another
8000h.

Therefore, a CFL would have about half the capital cost and a fifth of the
running costs. Bulb replacement costs will be similar over a long period.

Christian.

Tesco were selling Status branded 11 watt CFLs for £2.99 for three. They are
very good. Instant start and they reach full light output within a few
seconds.
Ikea ones take a long time to reach full light level but they have a good
choice of caps, sizes and wattages. The "compact" one sold by Screwfix
(11865) was huge and poor value for money.

Tesco were selling Status branded 11 watt CFLs for £2.99 for three. They
are
very good. Instant start and they reach full light output within a few
seconds.

You can get cheap bulbs. However, I prefer ones with bulb shaped enclosures
and a good light spectrum. These are rarely represented around the 1 pound
each mark.

OTOH, some well branded expensive ones I've found disappointing when
compared with unbranded cheap ones, so it doesn't necessarily follow that
cheap ones are always bad. It is sometimes luck of the draw, though.

Christian.