Is there an etch on the bulb? What wattage is this bulb?

I think 400w. These are usually available in 250w or 400w. Absolutely a nice find here! Better than the Powergroove.

Yes it is indeed 400 watt The etch is there, its a acid etch I believe outside etch good quality!

Would that lamp run on a 400W high pressure mercury ballast? or a different one?

Same one as i was told In fact this is a similar lamp that was used in Form109s i believe......

As I recalled they were using the old ANSI ballast at the time. Dunno if it is similar to modern ANSI version.

As far as i know, this lamp type set the standard for 400W MV ballast for the future...

what do you mean "for the future?"

He meant back in the 30s this lamp set the standard for mercury lamps (voltage, etc) for the decades after. Also set the standard for American probe and pulse start metal halide lamps in 175w and higher.

Beautiful specimen. I love the electrodes on these MA/V lamps.

Very cool!!!! A few years older than mine. What year were they first produced? Do you have any 'lit' pics of it??

Here's the pic of it lit

how much did u spend on this old guy ?

Even $200 USD is Cheap for a 1940s/60s Lamp in the UK These 180 watt SOX Low Pressure Sodium Lamps go for £80 or about $130 USD and they are still used on Major Roads and Motorways, No Wonder our Corporation Taxes are so High, and why Lighting Authorities are swtching over to HPS lighting.

Yes they are the Same Voltage and Current to the 400w High Pressure Mercury Lamp, (130 volts 3.2 amps) they are the Predesessors before the Quartz Arc Tube Mercury lamps were developed.

All the Best

Colin

I got this lamp for less than those prices.....that Colin mentioned!

How does the lumen output compare to a high pressure mercury vapor lamp?

Hmm according to here and here, a medium pressure merc has 16000 lumens and a high pressure merc has 20000 lumens.