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I am building a monochromatic lamp with the use of a low pressure sodium (LPS) lamp. Through research I understood I need a specific ballast for such a bulb.

The examples I found on the net feature a LPS bulb but only the 35W one. The ballast recommended for the 35W bulb was the Fulham Lighting WH3-120-L Workhorse 3 Adaptable Electronic Fluorescent Lamp Ballast, 120V, 64W max.

Unfortunately I require the 90W bulb for the project, as apparently it is possible to mount the bulb horizontally. I tried to look for a ballast for a 90W LPS, but often found products that are five times the price of the first mentioned ballast or that are unavailable in my area (I was only looking with those specific keywords.)

My question to you is: what kind of ballast should I be looking for for a low pressure sodium lamp of 90 watts?

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    It would not be absurd for a 90W lamp ballast to cost 5X what a ballast for a 35W lamp costs. Annoying, but not unusual, as the cheaper one may have far more mass-market usefulness leading to more production volume leading to economies of scale. – Ecnerwal Oct 28 '20 at 2:52
  • Here is the spec sheet for the WH3-120-L. Note the lengthy list of lamp types it supports, noting the table which indicates watts, current, PF, BF etc. for each lamp. Do you see your lamp on the list? – Harper - Reinstate Monica Oct 28 '20 at 3:01
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If I were you I'd be looking for a 90-watt low-pressure-sodium ballast.

That's pretty much the google phrase, though "SOX90 ballast" may also yield some fruit. Apparently SOX is the slang for this type of tube.

You know, you can get LEDs that emit a single color. In fact, LEDs were single-color for most of their existence. You'll have trouble beating SOX for efficiency, but LEDs will certainly be better for availability. The easiest way to get single-color LEDs in a vaguely consumer-buildable form-factor is in 12V LED strips.

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