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Tesla RVL 250W from 1961, has unique phosphor

Tesla RVL 250W from 1961, has unique phosphor

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This Czech baby has something like a calcium orthophosphate phosphor. Looks a lot like a halophosphor daylight fluorescent lamp at full brightness with a hint of green. Delicious I would say. The arc tube design is similar to my late 1950s Westinghouse E-H1s with the narrow pinch seals.

image~740.jpg image~734.jpg image~733.jpg image~732.jpg

Light Information

Light Information

Manufacturer:Tesla
Model Reference:RVL 250W
Lamp
Lamp Type:Mercury Vapor
Base:E40S
Shape/Finish:E-28
Service Life:???
Electrical
Wattage:250W
Voltage:130V
Optical
Lumen Output:11,000
Color Temperature:6000K
Color Rendering Index:25ish
Physical/Production
Dimensions:9"
Factory Location:Czechslovenkia
Fabrication Date:1961

File information

File information

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Filename:image~733.jpg
Album name:silverliner / good ol' mercury vapor
Keywords:Lamps
File Size:368 KB
Date added:Sep 17, 2015
Dimensions:2465 x 1848 pixels
Displayed:243 times
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Solanaceae
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Sep 17, 2015 at 08:26 PM Author: Solanaceae
Nice lampage. Must have some fat electrodes too I'd imagine.

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Sep 17, 2015 at 09:30 PM Author: funkybulb
Sweet find i would some day have to see this run up in person

No LED gadgets, spins too slowly.  Gotta  love preheat and MV. let the lights keep my meter spinning.

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Sep 17, 2015 at 10:35 PM Author: Silverliner
Don't piss your pants after seeing the color of this, LOL.

May all the great lighting technologies have their place in history.

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Sep 17, 2015 at 10:47 PM Author: dor123
Halophosphors are inefficient in converting long wave UVA into visible light, so the overall color of the lamp, should be the same as clear MV lamps, as the total amount of light added to the discharge from the phosphor is very low.

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.

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GoL
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Sep 17, 2015 at 10:55 PM Author: Silverliner
There is some degree of color correction from the phosphor so it still works. Plus the phosphor apparebtly absorbs some of the mercury lines which explains the limey tint similar to /Cs.

May all the great lighting technologies have their place in history.

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Sep 18, 2015 at 06:59 AM Author: ace100w120v
Does this run well on our gear here or did you have some European type gear for this?
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GoL
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Sep 18, 2015 at 01:22 PM Author: Silverliner
It sure runs fine on US H-37 and M-58 ballasts. I've lit it on both.

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Sep 18, 2015 at 06:09 PM Author: themaritimegirl
Neato!

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Sep 19, 2015 at 01:44 AM Author:
Dor, Tesla's RVL lamps were not coated with a halophosphate, but with an orthophosphate material (as indicated by Dave), so you cannot draw a direct parallel with fluorescent tubes.
To be exact, the material employed in the lamp shown here is manganese-activated calcium strontium magnesium orthophosphate. The divalent manganese activation results in the fluorescence emission in the long-wave part of the spectrum (i.e. in the red), which effectively makes this lamp part of the standard white class of mercury fluorescent sources (i.e. like pre-1967 HQL, pre-1968 HPL and American /C lamps). However, differences in host material results in a broadband emission from Tesla’s orthophosphate phosphor (emission even extending into the orange part of the spectrum), whereas fluorogermanate and arsenate hosts promote the emission in much, much narrower spectral bands. This is the result of different electrostatic interactions between the host-material crystal and the dispersed activator ions, which have a strong influence on the latter's energy levels.

By the way, Dave, your lamp was made in the company's Holešovice factory (also where the lamp research labs were), in northern Prague.
dor123
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Sep 19, 2015 at 02:18 AM Author: dor123
I've not seen that Dave indicated orthophosphate.

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.

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Dec 14, 2015 at 09:56 PM Author: Globe Collector
Is that one of Stan's log numbers I see on it Dave!

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105555521242365640724 UCM30tBQDUECOV6VeG5W87Vg zfarmadillo
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Apr 28, 2017 at 09:43 AM Author: Lumex120
Calcium Orthophosphate? Is the coating on these made of teeth or something?

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Apr 29, 2017 at 04:19 PM Author:
You're laughing, but haven't you noticed that teeth actually emit a fluorescent glow when illuminated with black light?
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