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Older EYE Iwasaki 175w Mercury Lamp

Older EYE Iwasaki 175w Mercury Lamp

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I picked this lamp up off of eBay. It’s nice since it has the old style red etch on top, with the giant eye. It’s kind of funny, as if you put the lamp base up in a NEMA head, highbay, or recessed can light, you would have a giant eye “staring” at you all the time.

One funny thing about the old eye lamps is how thin the phosphor coating is at the top. It reminds me of a Westinghouse lifeguard. The phosphor coating on the rest of the bulb is also rather grainy, like a Westinghouse lamp, but it does not possess the gradient of the phosphor progressively becoming thicker as it neared the base like a Westinghouse lamp has. Rather, it is uniformly grainy.

The lamp has a nickel plated base, but a brass center contact, unlike the modern EYE mercury lamps which have both a nickel plated base and center contact.

Another interesting note about the construction is how the top arc tube support band is only welded to one of the frame wires, not both like normal, yet the lamp has a support frame that runs up both sides up the arc tube. It is not the economized frame which has support on only the one side.

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Light Information

Light Information

Manufacturer:EYE Iwasaki
Model Reference:HF175PD
Lamp
Lamp Type:Mercury Vapor
Filament/Radiator Type:High Pressure Mercury Discharge and Yttrium Vanadate Phosphor
Base:E39 (Mogul Edison Screw)
Shape/Finish:BT28
Service Life:24000 Hours
Electrical
Wattage:175w
Voltage:130v
Current:1.5a
Optical
Lumen Output:8900lm
Color Temperature:4100k
Color Rendering Index:40 CRI
Physical/Production
Factory Location:Nippon

File information

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Album name:Mr. Orthosilicate / Mercury Vapor Lamps
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Date added:Oct 27, 2019
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Date Time:2019:10:27 14:40:14
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James
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Oct 28, 2019 at 12:26 AM Author: James
Really nice example, its rare to find old Asian lamps. It must be one of the first Power-Deluxe lamps with improved coating.

Does it also have an inside etch? Chromium and iron oxides were normally used for the red etches, but necessary chromium salts were banned in various countries during the 1980s-1990s due to their toxicity and then the red etches began to disappear from many lamps.
Mr. Orthosilicate
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Nov 29, 2019 at 07:17 PM Author: Mr. Orthosilicate
I think it does have an inside etch.
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