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Unusual, caesium filled lamp with PCA arc tube

Unusual, caesium filled lamp with PCA arc tube

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This type lamps was tested as source of excellent, multiline white light source. But efficiacy was relatively low.

P_109_x.jpg P_218_HP_K_(draslík)_400W.jpg P_234_Tesla_1992_Cs_různé.jpg P_234_Tesla_1992_Cs_různé_(3).jpg

Light Information

Light Information

Manufacturer:TESLA, plant No.1 Holešovice
Lamp Type:caesium filled
Lumen Output:ca 23000
Color Temperature:3000
Color Rendering Index:over 95
Fabrication Date:1992
Application/Use:engineering sample

File information

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Album name:Trianero2012 / Out of classification - miscellaneous
File Size:136 KB
Date added:Sep 24, 2012
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Sep 25, 2012 at 10:47 AM Author: AngryHorse
Was this an attempt to make a `white son` of a large size?, 23000 lumens for 3000K is not too bad, (same as a 400watt MV), but then GEs SP 30 Multi-Vapor will do 33000 lumens in the same colour for 400watt.

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Sep 30, 2012 at 06:33 AM Author:
The idea behind this high-pressure caesium lamp goes back to the late 50, when the first samples of PCA arc tubes where developed at GE. The goal at that time was to use these vessels for the containment of alkali vapor discharges operating at a medium-high pressure in order to promote a quasi-molecular broadening of their emission lines and obtain a wide emission spectrum. Caesium was at first at the focus of GE's attention because this vapor under high pressure (i.e. 20-500 mbar, everything's relative!) yields a white light emission with an excellent color rendition. Remember that at the time the only HID lamp available on the market was the HPMV lamp, available in clear, /W and /C versions, which had a similar efficacy (50-55 lm/W) but had a far less pleasing light color.

Caesium quickly lost the favors of development engineers when it was realized that a far higher efficacy (in excess of 100 lm/W) could be achieve with sodium. The light color was certainly not as good but the rendering was at par with that of clear mercury lamps, and the warm golden orange light color was certainly pleasing to the eye ... all that was enough to tip the balance toward the lamp design/fill we know of nowadays. Interestingly, caesium lamps are still produced to this day - although on a very limited scale - due to its capacity to emit strongly in the shortwave infrared domain, which is useful to certain applications such as CCTV.
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