Huge wrote:
On 2010-02-18, Bob wrote:
Huge wrote:
On 2010-02-16, Bob wrote:
PeterC wrote:
fOn Mon, 15 Feb 2010 11:11:55 -0800 (PST), Owain wrote:

On 15 Feb, 09:10, PeterC wrote:
Just rebuilt a mid-'60s bog-standard Anglepoise lamp

Fit a 12V lamp into a BC adapter in the lampholder and use an external
transformer so the Anglepoise is only running low voltage.

Owain

Certainly avoids 240V on the lamp, but portability...

Also, I'm 'tuning' it to take a CFL.

If by tuning you mean adjusting the counterbalance springs then fair
enough. Without such adjustment, a CFL will be far too heavy and the
lamp end will droop.

Err, I'm sat looking at an Anglepoise lamp which has a 5W CFL in it. No
adjustment to the springs required.


Surprised to read that Hugh. Anglepoise lamps I have seem to be so
critically balanced that a tap on the lamp shade will set it moving. The
springs give a fairly well damped oscillation and it soon comes to rest
at the original position.

I assume that a 5w CFL will be quite a bit heavier than a 'proper' bulb

A challenge!

The Ring 5W CFL in there weighs 35gm (on my electronic kitchen scales, which
only resolve to 5gm) and an Osram 40W GLS bulb weighs 30gm.

It's a genuine (although probably at least 25 years old and slightly
battered after several house moves) Anglepoise with (non-adjustable)
springs. I'm sure my Dad had one with adjustable springs, although Gawd
knows where that went.

and hence my comment.
What happens to your lamp if you take the bulb out? Mine shoot skywards.

Mine too.

Very interesting Hugh. I'd have thought that the transformer in the CFL
would add much more weight. maybe with a low power inverter, a small
ferrite suffices. I don't have a 5w cfl to hand but the lowest power one
I do have is 15w and that weighs 130gm.

As an aside, I just switched on the light in the cupboards where the
spare lamps are kept and it pinged so had to fit a new one!!

Bob