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Reprographic lamp I’ve had this lamp for a few years and no information on it other than it’s a 4kW reprographics lamp. I have previously posted it on LG. It appears to be a halide lamp. However, I assumed it was mercury based but there is little sign of liquid metal in the lamp. The top image is at ignition and shows there are other elements evaporating. The lower image is of the lamp hot but at only 250W loading. I attempted to take an image of the spectrum but its so bright it saturates the detail. I read some where these sometime have gallium and iodine in them. Keywords: Lamps

Reprographic lamp

I’ve had this lamp for a few years and no information on it other than it’s a 4kW reprographics lamp. I have previously posted it on LG. It appears to be a halide lamp. However, I assumed it was mercury based but there is little sign of liquid metal in the lamp. The top image is at ignition and shows there are other elements evaporating. The lower image is of the lamp hot but at only 250W loading. I attempted to take an image of the spectrum but its so bright it saturates the detail. I read some where these sometime have gallium and iodine in them.

CMH35_par.jpg CMH250.jpg 4kW_repro2.jpg green_gec.jpg blue_250.jpg
Lamp/Fixture Information
Manufacturer:unknown
Model Reference:reprographic halide
Lamp
Lamp Type:Halide
Electrical
Wattage:4000W
File information
Filename:4kW_repro2.jpg
Album name:Tuopeek / Metal-Halide
Keywords:Lamps
Filesize:268 KiB
Date added:26 Oct 2024
Dimensions:2400 x 2000 pixels
Displayed:452 times
DateTime Original:2024:10:26 13:10:04
Exposure Time:1/640 sec
FNumber:f/13
File Source:Digital Still Camera
Flash:No Flash
Focal length:38 mm
ISO:100
Model:NIKON D3400
Software:Adobe Photoshop Elements 2.0
White Balance:0
URL:https://trad-lighting.net/gallery/displayimage.php?pid=572
Favourites:Add to Favourites

Comment 1 to 3 of 3
Page: 1

Ria   [Sat 26 Oct 2024 at 23:24]
Interesting, unfortunately I can't help, but maybe Max will have some insight into this lamp..?
Max   [Sun 27 Oct 2024 at 11:29]
It's really difficult to say which additives are used in this particular lamp from this spectrum, which is clearly dominated by mercury. Running the lamp at less than 10 % of its nominal wattage is clearly not enough to vaporize a sufficient amount of the iodide additives for a spectral identification. When it comes to MH lamps for reprographic applications there are several possibilities for the fill chemistry which involve the following elements: indium, gallium, thallium, iron, cobalt, lead, tin, nickel.
Tuopeek   [Sun 27 Oct 2024 at 16:43]
Thanks Max, if I can set it up so that I can capture the spectrum better and run the lamp at a much higher loading I might have another go at investigating. I really need to try making a better and calibrated spectroscope. I initially did suspect mercury in there but there were a number of other lines making me unsure with out a side by side comparison.

Comment 1 to 3 of 3
Page: 1