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Spectral lines Multi-vapor This is a close-up image of the arc tube in the GE Multi-Vapor MVR400/U/40 lamp discussed. I have taken this image under a fixed camera white-balance set to daylight to show the warm output. I have also added the insert image of its spectral output. Keywords: Lamps

Spectral lines Multi-vapor

This is a close-up image of the arc tube in the GE Multi-Vapor MVR400/U/40 lamp discussed. I have taken this image under a fixed camera white-balance set to daylight to show the warm output. I have also added the insert image of its spectral output.

CDO_PHIL_250W.jpg bottles.jpg GE_R400H.jpg MF250x.jpg Sharxs.jpg
Lamp/Fixture Information
Manufacturer:GE
Model Reference:MVR400/U/40
Lamp
Lamp Type:Halide
File information
Filename:GE_R400H.jpg
Album name:Tuopeek / Metal-Halide
Keywords:Lamps
Filesize:235 KiB
Date added:17 Nov 2025
Dimensions:2250 x 1678 pixels
Displayed:543 times
DateTime Original:2025:11:17 19:54:04
Exposure Time:1/4000 sec
FNumber:f/29
File Source:Digital Still Camera
Flash:No Flash
Focal length:42 mm
ISO:100
Model:NIKON D3400
Software:Adobe Photoshop Elements 2.0
White Balance:1
URL:https://trad-lighting.net/gallery/displayimage.php?pid=1057
Favourites:Add to Favourites

Comment 1 to 8 of 8
Page: 1

Ria   [Mon 17 Nov 2025 at 19:57]
Oh wow, this is amazing Bulb Man
Tuopeek   [Tue 18 Nov 2025 at 17:03]
Thanks Ria, I certainly had to suffer temporary blindness to achieve this picture Laughing
Ria   [Tue 18 Nov 2025 at 18:50]
Been there, done that Mr. Green
Max   [Thu 04 Dec 2025 at 22:41]
Nice shot, and the spectrum insert is a very nice touch too. Based on the latter your lamp definitely has sodium and scandium, but given its light color it is clear that sodium dominates the light output, more than it should be. If the lamp is not overdriven, then this is a clear sign that either sodium iodide was dosed well in excess of the lamp's specification, or there is too little scandium.
Tuopeek   [Fri 05 Dec 2025 at 16:29]
Thanks Max, perhaps a fortunate accident, as it had a great colour temperature for indoor use.
Max   [Sat 06 Dec 2025 at 05:16]
That's a fortunate accident indeed. Are you actually planning on using it for indoor lighting? Its 40 klm output might be a bit too much...
Tuopeek   [Sat 06 Dec 2025 at 11:10]
Only on occasion. It's a cheerful warming light that blast away any seasonal depressions in the long winter months Laughing
Max   [Sun 07 Dec 2025 at 05:54]
I believe you. I use a combination of 100 W mercury and 150 W metal halide as an effective way to address SAD, and it works very well, so I can imagine what a 400 W MH lamp can do... Even if yours has a warm-white light color, I'm sure it has plenty of blue light to kill your melatonin.

Comment 1 to 8 of 8
Page: 1