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Ceramic halide miniture lamp

Ceramic halide miniture lamp

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Ceramic metal halide lamp and ballast, inside ballast and spectrum. This is a very small lamp rated at 20W and about the same size as a halogen downlighter.

power_star_s.jpg CDM_lamp.jpg CMH_lamp.jpg WOTAN_125.jpg

Light Information

Light Information

Manufacturer:GE
Model Reference:CMH
Electrical
Wattage:20w

File information

File information

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Filename:CMH_lamp.jpg
Album name:tuopeek / High Pressure Lamps
Keywords:Lamps
File Size:258 KB
Date added:Jan 04, 2016
Dimensions:1000 x 1356 pixels
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Date Time:2016:01:04 19:57:42
DateTime Original:2016:01:04 06:44:10
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FNumber:f 8
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Focal length:4.3 mm
ISO:64
Make:FUJIFILM
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lights*plus
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George Liv


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Jan 04, 2016 at 02:57 PM Author: lights*plus
Very nice I appreciate the gorgeous spectrum. Your setup? Only I would put shorter wavelenghts on the left going up to the right.

Well driven sodium! That's the reason it's a 3000 K lamp. Both GE lamp & electronic ballast part of a fixture (& came with each other)?
tuopeek
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tuopeek 111967450636623837217 tuopeek1 77334065@N05/
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Jan 04, 2016 at 03:08 PM Author: tuopeek
Thanks, home made spectroscope and my camera doesn't like focusing in it which is annoying as the image is sharper in real life. Interesting I have always assumed lower frequency on the left! The GE lamp and ballast are from the one fixture.
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David Ressel
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Jan 04, 2016 at 06:08 PM Author: mrjukebox160
I have never seen a 13uf cap before.
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Jan 04, 2016 at 08:36 PM Author: Globe Collector
I'm still trying to get one of these MR-16 emulating Metal Halides. The spectrum is radically different from the CDM-Tm, sodium, thallium and mercury are ubiquitously present, but the fine plethora of lathanon lines is much more prominent here...and different. There seems to be quite a bit more up the blue end...is this a 4000K lamp whilst the CDM0Tm is 3000K?

I see a boost architecture crest factor corrector, MOSFET to left and choke centre-top, then a full-bridge driver circuit, choke at right and four MOSFETs below it. Interesting that they are not heatsunk by being sweat-soldered to a large area of copper.

I also have to admit that 13uF is a wierd non R12 value...obviously chosen as a careful tradeoff between flicker and space inside the box.

I imagine that there is a fair bit of surface-mount oomph on the other side of the PCB? One big chip doing it all or a separate crest factor boost driver and full bridge driver with a couple of hi-side, lo-side drivers?

Manufactured articles should be made to be used, not made to be sold!

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tuopeek 111967450636623837217 tuopeek1 77334065@N05/
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Jan 05, 2016 at 01:08 PM Author: tuopeek
Never spotted the cap value while I had the board out! Yeah, it is a busy board with SMT on the solder side. It is a 3000K version. There is a lot of blue but they are noticeably dimmer lines. My camera focus is not great as the spectrum looks better by eye. I must try and improve the pictures. The Spectroscope is home made using a bit of drainage pipe. Is a fairly good gratting inside. I use it mainly for school demonstrations.
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