Incandescent bulbs - decision, plus Edison Screw question

On 27/05/2014 10:36, John Hall wrote:

There's a stall at my local market that still sells them - or at least
did a few months ago when I last checked. I understand that it is still
legal to sell them for "heavy duty" non-domestic use, and it seems to be
left to the conscience of the buyer as to whether their usage will be
acceptable.

It is perfectly legal to sell incandescent light bulbs. The rules
forbade the manufacture or import of high wattage domestic light bulbs.

The rules made an exception of "industrial" light bulbs (I think there
were concerns about fast rotating machinery and the strobe effects
possible with CFLs in the proximity) and nobody thought to prevent the
sale of industrial bulbs for domestic use.

Jim

On Tue, 27 May 2014 12:14:14 -0500, "Steve Thackery"
wrote:

I sometimes
justify a purchase to myself by deciding its cost has come from the
"curiosity fund", and is thus valid because it could be interesting.

Totally agree! As I put it, Norman should consider it as an investment
in scientific research.

Of course the expensive colour-changing LED bulb with the remote
control needed a bit more justification than usual. I'm glad there was
no-one else but me involved in presenting the argument. :-)

Definitely an improvement on my childhood experiments with a row of
battenholders fixed to a plank and a load of different coloured pygmy
bulbs from Woolworths.

Rod.

On 27/05/2014 00:49, Steve Thackery wrote:
Indy Jess John wrote:

For the larger sizes (big ES and standard bayonet) there are adaptors
for sale which will convert one to the other, either way round. It
could be easier to standardise on one type of fitting and use
adaptors for the installations which want the other type.

Really? I never knew that - thanks for the heads up.

I suppose the only possible shortcoming is that they will make the bulb
"longer", so to speak, which doesn't always suit the luminaire. Even
so, it's well worth knowing.

I found them on the Maplins website
http://www.maplin.co.uk/p/bc-to-es-adapter-bk70m
http://www.maplin.co.uk/p/es-to-bc-adapter-bk69a

That is not a recommendation, just a likely source and when I found them
I posted. I am sure if you hunt around you might find better/cheaper
elsewhere, but at least you know there is definitely one sighting.

Jim

Norman Wells wrote:
Steve Thackery wrote:
Norman Wells wrote:

The point is, I've been misled before. Now I want a demo before I
buy what turns out to be another not very white elephant..

I'm so tempted to send you a tenner just so you can try one. But
something tells me you might already have decided the outcome........

Can't I just carry on with my incandescents please? Like I say, they
don't waste significant energy and don't save significant money. I can
read by them, they cost less, I understand what I'm buying, they fit in
the holders, I can use them with lampshades, they're not directional,
they don't make me look ill, and I LIKE them.

I'm slowly coming round to the view that they might actually be quite good.



With me it's a matter of principle. When things are going to be banned I
always like to get a few in stock.

Bill

wrote:

I'm slightly disappointed in view of your erudite replies and
knowledge of things that the Number isn't Forty Two.

Yes that would have been amusing. I could have added some sort of Hitch
Hiker motif.


I'm still hanging on to an enamel Youngers No 3 Pump clip like this
http://www.pumpclipmuseum.com/USERIM...oung%20no3.jpg
should I ever move into a no 3 .
The other half discounted this factor when we last looked for a house.

But how very excellent it would be to have that as your house number!

Bill

Steve Thackery wrote:
Bill Wright wrote:

While we're on about LEDs, may I show off my recent LED project?
(Some of you might have seen this before)

Lovely! But have you run those LEDs in parallel? I thought that was
supposed to be naughty because of current hogging. Anyway, I like it
when practicality proves theory wrong!


Yes, there's about a hundred of them in parallel. Is that a bad thing?

Bill

In article ,
Indy Jess John wrote:

800 lumens from a 12W LED is slightly better than 740 lumens from a 15W
CFL (according to the packet - I haven't measured the actual light output).

For CFLs there is some difference between makes. I have seen claimed
60W equivalent CFLs at 15W and 17W depending on manufacturer.

The Philips CFLs they sell in Sainsbury's claim 60W equivalence and
741 lumens for a 12W lamp.

The first site Google returns for "led cfl efficiency" makes absurd
claims, saying that 60W equivalent LED is 6-8W compared with 13-15W
for CFLs. This is an exaggeration, but it goes on to say that a CFL
produces 30 BTU/hour of heat while an LED produces 3.4 BTU/hour. 7W
is in fact 24 BTU/h and 14W is 48 BTU/h, so neither of these bears any
resemblance to reality. A lamp that uses half as much electricity
will produce half as much heat, not a tenth as much. But then they
are selling LED lamps.

-- Richard

In article ,
Paul Ratcliffe wrote:

...I don't have any 40W or 60W bulbs. What can I get to replace
100W or even 150W incandescents?

AIUI a big problems with LEDs is that their remarkable efficiency only
applies at low temperatures. From the discussion here they seem to be
able to produce 60W equivalent devices that are more efficient than
CFLs, but not yet 100W equivalents which would get hotter. This will
presumably improve over the next few years.

-- Richard

In article ,
Ian Field wrote:

A lot of shops have 70W halogen capsules assembled in a regular size glass
bulb and bayonet cap, being halogen; 70W is probably just as bright as a
100W regular filament.

Philips do a 105W halogen which they caim to be equivalent to 140W
incandescent, but it doesn't look that much brighter than a 70W one to
me.

-- Richard

Norman Wells wrote:

What I'm asking is whether there is any real reason I should change
at all. I prefer incandescents. What good does it do anyone,
including me, if I change?

I think you might be missing the point, Norman. I believe all anyone
is saying is that if you try one of the latest LED lamps, you may no
longer prefer incandescents.

When you *have* tried a new LED lamp, and *still* prefer incandescents,
then that's just fine and we'll all shut up. Nobody is trying to
convert you to LEDs. We are just trying to convince you to try one.

--
SteveT