Hi, I have just bought a copper lamp at a boat jumble nasty green but
with a lot of effort will make a great headlamp with its ridged glass.
Problem (there is always one) the bulb is etched with the number 622
with no voltage it is a small bayonet fitting with a vertical coiled
filament supported by a c type filament holder. I have googled with no
success 12v hasn't lit it up but that could be the crap wiring. If no
info I will replace it with a sbf bus bulb.

Don't you have a friend with a test meter?
First check the resistance of the filament & the wiring then check the
current flow on 12v and higher voltages.

-- 
Dave Croft
Warrington

"back to the boats"  wrote in message 
news:d71694cf-8ae4-4d58-8a12-71756c81dbaf@y38g2000hsy.googlegroups.com...
> Hi, I have just bought a copper lamp at a boat jumble nasty green but
> with a lot of effort will make a great headlamp with its ridged glass.
> Problem (there is always one) the bulb is etched with the number 622
> with no voltage it is a small bayonet fitting with a vertical coiled
> filament supported by a c type filament holder. I have googled with no
> success 12v hasn't lit it up but that could be the crap wiring. If no
> info I will replace it with a sbf bus bulb.

On Sat, 24 May 2008 08:00:27 -0700 (PDT), back to the boats
 wrote:

>Hi, I have just bought a copper lamp at a boat jumble nasty green but
>with a lot of effort will make a great headlamp with its ridged glass.
>Problem (there is always one) the bulb is etched with the number 622
>with no voltage it is a small bayonet fitting with a vertical coiled
>filament supported by a c type filament holder. I have googled with no
>success 12v hasn't lit it up but that could be the crap wiring. If no
>info I will replace it with a sbf bus bulb.

622 is a standard bulb code for auto electrical retailers, if you cannot find
anything on-line or from here, I'll ask our guy on Tuesday.

Peter
--
Peter & Rita Forbes
Email: diesel@easynet.co.uk
http://www.oldengine.org/members/diesel
http://www.stationary-engine.co.uk
http://www.oldengine.co.uk

On Sat, 24 May 2008 17:45:46 +0100, Peter A Forbes wrote:

> 622 is a standard bulb code for auto electrical retailers, 

That thought went through my mind as well but google doesn't spit out 
anything useful with "622 bulb" as a search...

-- 
Cheers
Dave.

"Dave Liquorice"  wrote in message 
news:nyyfbegfubjuvyypbz.k1einf3.pminews@srv1.howhill.net...
> On Sat, 24 May 2008 17:45:46 +0100, Peter A Forbes wrote:
>
>> 622 is a standard bulb code for auto electrical retailers,
>
> That thought went through my mind as well but google doesn't spit out
> anything useful with "622 bulb" as a search...
>
> -- 
> Cheers
> Dave.
>

Didn't you Google for "622 lamp"?  Remember the Blackpool Corporation 
electrician:  "162,000 lamps and not a single bulb".

John 




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Dave Croft wrote:
> Don't you have a friend with a test meter?
> First check the resistance of the filament & the wiring then check the
> current flow on 12v and higher voltages.
> 
===
Not quite that easy, I'm afraid.

The difference between the hot (running) resistance and cold resistance 
as measured with an ohmmeter is of the order of 20 times. i.e., on 
initial switch-on, about 20 times the running current inrushes. Newish 
bulbs can withstand this. That's one of the reasons why older bulbs 
often blow when first switched on (the other is the magnetic force due 
to the inrush surge which blows the coils asunder)

One way might be to measure and compare the cold resistances of a bulb 
of known voltage, but they'd have to be of the same wattage, and I 
understand that this is not known.

I'd start off with a low voltage and step it up, the problem being (1) 
you'd need a variable supply and (2) how would you know when it is up to 
its design brightness?

However, as you'd hope that bulbs are rated at standard voltages, you 
could try stages of 12, 24, 32,50,110 etc. When it blows, go back one 
step ...

JW²
===

On Sat, 24 May 2008 23:00:17 +0100, John Nice wrote:

> Didn't you Google for "622 lamp"?  

Doesn;t help either, and yes I'm aware of the abscenec of "bulbs" and the 
things that hold lamps are luminaires.

-- 
Cheers
Dave.

http://www.donsbulbs.com/cgi-bin/r/b.pl/622~lucas.html

"back to the boats"  wrote in message
news:d71694cf-8ae4-4d58-8a12-71756c81dbaf@y38g2000hsy.googlegroups.com...
> Hi, I have just bought a copper lamp at a boat jumble nasty green but
> with a lot of effort will make a great headlamp with its ridged glass.
> Problem (there is always one) the bulb is etched with the number 622
> with no voltage it is a small bayonet fitting with a vertical coiled
> filament supported by a c type filament holder. I have googled with no
> success 12v hasn't lit it up but that could be the crap wiring. If no
> info I will replace it with a sbf bus bulb.

"Gordy"  wrote in message 
news:INW_j.32532$zc6.20918@newsfe29.ams2...
> http://www.donsbulbs.com/cgi-bin/r/b.pl/622~lucas.html
>
Everything appears to be "Sold out" but you can hire him to find them for 
you ;-) Why bother when Google finds them for free!

ttfn
-- 
Roland Craven
Nr. Exeter, Devon, UK
roland@petternut.co.uk
www.petternut.co.uk

On Tue, 27 May 2008 17:38:08 +0100, "Gordy"  wrote:

>http://www.donsbulbs.com/cgi-bin/r/b.pl/622~lucas.html
>
>"back to the boats"  wrote in message
>news:d71694cf-8ae4-4d58-8a12-71756c81dbaf@y38g2000hsy.googlegroups.com...
>> Hi, I have just bought a copper lamp at a boat jumble nasty green but
>> with a lot of effort will make a great headlamp with its ridged glass.
>> Problem (there is always one) the bulb is etched with the number 622
>> with no voltage it is a small bayonet fitting with a vertical coiled
>> filament supported by a c type filament holder. I have googled with no
>> success 12v hasn't lit it up but that could be the crap wiring. If no
>> info I will replace it with a sbf bus bulb.
>

I went through Vince's catalogues with him  this afternoon, as I was in Luton
getting the wheels rotated on the van, and we could find no reference at all to
a 622 bulb, either in old or new books/catalogues.

623 exists, but no 622 as far as we could see.

Peter
--
Peter & Rita Forbes
Email: diesel@easynet.co.uk
http://www.oldengine.org/members/diesel
http://www.stationary-engine.co.uk
http://www.oldengine.co.uk