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CDM Reflector PAR 30L 70W

CDM Reflector PAR 30L 70W

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This looked like a new lamp but on opening I found it to be expired. Not sure what life it had but it will only flicker faintly with about 10kV applied. I was also surprised to see it is a lamp inside a lamp. and not constructed like a SON-R

XBO180W.jpg CDM-R70w.jpg induct.jpg sox55_elect3.jpg

Light Information

Light Information

Model Reference:CDM-R

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Album name:tuopeek / Failed Lamps
File Size:229 KB
Date added:Jan 02, 2019
Dimensions:2000 x 1205 pixels
Displayed:96 times
Date Time:2019:01:02 19:51:31
DateTime Original:2019:01:02 14:34:35
Exposure Bias:0 EV
Exposure Time:1/250 sec
FNumber:f 5.6
Flash:No Flash
Focal length:18 mm
Model:NIKON D3400
Software:Adobe Photoshop Elements 2.0
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Jan 02, 2019 at 03:01 PM Author: Medved
The tripple bulb construction is likely designed as a way to handle the possible burner explosion...

No more selfballasted c***

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Jan 02, 2019 at 03:51 PM Author: rjluna2
Probably it has been leaked into the capsule

Pretty, please no more Chinese failure.

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Jan 02, 2019 at 05:25 PM Author: James
Indeed it looks like an arc tube leak into the vacuum capsule. There are black deposits on the ends of the arc tube, which happens when there is a glow discharge in the outer which sputters molybdenum from the frame.

The reason for the triple envelope design is because these PAR lamps are not vacuum-sealed. The front lens is glued to the reflector with epoxy, and the neck area in the cap is open. The end seals of the arc tube would oxidise within a few hours if burned in the air, so they have to be protected with a small evacuated middle bulb.
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