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Metal Halide part broken off inside the lamp?

R

Rupert Bear

Jan 1, 1970
0
I bought this unused Sunmaster 1000W Metal Halide lamp cheap from an eBay auction,
it arrived with this part adrift inside lamp:

http://img222.imageshack.us/img222/3515/lampuy6.jpg

(On the left is a 600W metal halide for comparison).

I haven't tried this lamp yet, is the functioning of this part affected by its
detachment?

Any information much appreciated :)

Rupert Ward.
 
V

Victor Roberts

Jan 1, 1970
0
I bought this unused Sunmaster 1000W Metal Halide lamp cheap from an eBay auction,
it arrived with this part adrift inside lamp:

http://img222.imageshack.us/img222/3515/lampuy6.jpg

(On the left is a 600W metal halide for comparison).

I haven't tried this lamp yet, is the functioning of this part affected by its
detachment?

Any information much appreciated :)

Rupert Ward.

I agree with the previous answer.

The part is the getter and as long as it does not touch
either the arc tube or the leads while the leads while the
lamp is operating you should be OK.


--
Vic Roberts
http://www.RobertsResearchInc.com
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This information is provided for educational purposes only.
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site without written permission.
 
R

Rupert Bear

Jan 1, 1970
0
Rupert, that part seems to be a 'getter'. It's function is to act
like a sponge, to mop up any stray gas molecules, both during lamp
manufacture, and any that may be evolved by heating during operation
of the lamp. It serves the same function as the older 'flashed'
barium getter, the sort of black or metalic silver deposit found at
one end of some types of lamp, and vacuum tubes. The fact that it has
become detached won't prevent the lamp from operating, unless its
metal casing were to short out the connections to the arc tube; I'm
not sure if it's large enough to be able to do this. Since it would
be lying in the bottom of the lamp, well away from the arc tube, it
would probably be less effective as a getter, but how much of an
effect this would have, I'm not sure.

Thank you for information, I thought it was some kind of absorber, but
of what I hadn't a clue.

I fired the lamp up after reading your post and is working ok.

As it is a horizontal orientation design, I can leave the getter directly
below the middle of the arc tube, which is quite close at 35mm so
hopefully it will work as intended.

Thank you again, for your time in helping me with this problem :)

Regards,
Rupert.
 
R

Rupert Bear

Jan 1, 1970
0
Victor Roberts said:
I agree with the previous answer.

The part is the getter and as long as it does not touch
either the arc tube or the leads while the leads while the
lamp is operating you should be OK.


--
Vic Roberts
http://www.RobertsResearchInc.com
To reply via e-mail:
replace xxx with vdr in the Reply to: address
or use e-mail address listed at the Web site.

This information is provided for educational purposes only.
It may not be used in any publication or posted on any Web
site without written permission.

Thanks Vic, good to get a second opinion :) I will definitely
make sure it's well away from those areas before switching on!

Rupert.
 
C

Chuck Stewart

Jan 1, 1970
0
Victor Roberts said:
I agree with the previous answer.

The part is the getter and as long as it does not touch
either the arc tube or the leads while the leads while the
lamp is operating you should be OK.
<snip>
Vic is correct. The getter contains barium peroxide to getter (react with)
hydrogen, and a metal casing that will getter oxygen. Since it will be
running quite a bit cooler lying on the bulb wall than when it was attached
to the mount it will probably not work as well as it should.

Chuck Stewart
 
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