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YAG transparent ceramic metal halide lamp for Research & Development.

YAG transparent ceramic metal halide lamp for Research & Development.

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70w 3000k ceramic metal halide lamp. Specially produced for engineering testing and measurement with transparent Yttrium Aluminium Garnet arc tube.

Normal ceramic metal halide & high-pressure sodium lamps are made from sintered polycrystalline alumina. These arc tubes appear opaque due the light scattering effect of the crystalline grains that make up the structure of the ceramic material.
This is troublesome for lamp engineers who wish to make certain diagnostic measurements of the arcstream and electrodes of the lamp during operation.
Forr this reason special lamps with transparent arc tubes are sometimes produced.
High-pressure sodium arc tubes can be made transparent by growing the arc tube out of a single crystal of alumina instead of sintering but this is not possible for metal halide lamps which require complex shaped arc tubes.
A special ceramic material, Yttrium Aluminium Garnet is used whose crystal grains are so tiny that they do not scatter the light and a transparent ceramic arc tube can be created. This lamp was used for measuring electrode temperatures at full power.
As this process is more than 50 times more expensive than normal ceramic lamps, for obvious reasons they have not been commercialized.

Special thanks goes to James for this. :)

Lit pic:
http://www.lighting-gallery.net/gallery/displayimage.php?pos=-109117

DPP00003030.jpg DPP00003010.JPG DPP00001575.JPG DPP00001571~0.JPG

Light Information

Light Information

Lamp
Lamp Type:CDM-T
Base:G12
Electrical
Wattage:70w
Optical
Color Temperature:3000k

File information

File information

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Filename:DPP00001575.JPG
Album name:FrontSideBus / HID: Metal halide
Keywords:Lamps
File Size:2105 KB
Date added:May 29, 2015
Dimensions:1920 x 1280 pixels
Displayed:240 times
Date Time:2015:05:29 22:22:11
DateTime Original:2015:05:29 20:07:07
Exposure Bias:0.333333333333 EV
Exposure Time:13/10 sec
FNumber:f 16
Flash:No Flash
Focal length:60 mm
ISO:100
Make:Canon
Model:Canon EOS 70D
Software:Digital Photo Professional
White Balance:0
URL:https://www.lighting-gallery.net/gallery/displayimage.php?pos=-109116
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rjluna2
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Robert


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May 29, 2015 at 08:42 PM Author: rjluna2
Amazing, FSB

Is this prototype?

Pretty, please no more Chinese failure.

tolivac
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May 29, 2015 at 11:33 PM Author: tolivac
Wouldn't the YAG arc tubes be too expensive to use in production lamps?
dor123
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May 30, 2015 at 12:11 AM Author: dor123
The problem with YAG is that while it immune to common metal halides (Sodium, thallium, etc...) , it is correded cruelty by rare earths (Dysprosium, holmium, thulium, cerium, etc...), so it isn't suitable for MH lamps (More suitable for Na-Sc chemistry than the usual ceramic MH chemistry which involves rare-earths). But as YAG is much more resistant to sodium than alumina, it can be used with HPS arctubes instead.

I"m don't speak English well, and rely on online translating to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

I only working with the European date format (dd.mm.yyyy).

I lives in Israel, which is a 230-240V, 50hz country.

FrontSideBus
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May 30, 2015 at 02:19 AM Author: FrontSideBus
Yes, they are too expensive for production lamps, as stated in the description, they are made for engineering use only.

UK out of the EU!
http://www.lighting-gallery.net/gallery/index.php?cat=11271

rjluna2
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Robert


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May 30, 2015 at 09:05 AM Author: rjluna2
Cool, FSB

Pretty, please no more Chinese failure.

FrontSideBus
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May 30, 2015 at 02:19 PM Author: FrontSideBus
Indeed it is! It's not everyday that one gets to see inside a CMH lamp at full power!

UK out of the EU!
http://www.lighting-gallery.net/gallery/index.php?cat=11271

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