Hi all,
I am new to this site and excited about it! I recently purchased three 26W Low Pressure Sodium Vapor Lamps. I'm a theater designer and am interested in using two of them in a show I have coming up in a few weeks. I am very new to the world of SOX lamps and am having trouble finding the correct Ballast for them. I was hoping to get an electronic ballast because they seem easier to find/cheaper and I don’t need an ignitor but am unsure which one to get. I know it needs to be at least 26Ws but can it be more than that? The system I’m running it on is 3 phase power, 120v, most bulbs we run on this system are 750w so I’m not really worried about getting power to it. Mostly just how to get it to actually work. I’m attaching a link to the bulbs below.

https://www.ebay.com/itm/186339138191

Also if someone knows what kind of base is required, It says it’s E26 but I’m not familiar with the bipin setup, do I need worry about the voltage since it is a different base then a typical E26?


Sorry for the long list of question
I appreciate any and all help!

SOX (and pretty much any Low Pressure Sodium lamps) are rather different from most discharge lamps..! There are dedicated ballasts for them, but I wouldn't recommend running them on a fluorescent ballast. I think you're in the US, am I right..? In which case one of the Fulham Workhorse ballasts might work, I've seen a few people here use them. Bear in mind that with any discharge lamp, the lamp current is key. 26W SOX-E lamps are designed for a current of 0.37A at 59V (on a dedicated SOX-E ballast, which are quite rare) but they will run successfully on normal 35W SOX gear at 0.6A (also 59V).

Don't confuse the designations of the E26 lampholder and the 26W SOX-E lamp though, it really should be quoted as 26W SOX-E rather than S26, but there we go. The lampholder is a standard B22d bayonet cap, most common here in the UK. If you can't find one, let me know, I have a few spares and could send you one for the price of the shipping.

Anyway, welcome to the site and also the wonderful world of LPS lighting, which in my (admittedly biased) opinion, is the best lighting in the world 

Thank you for such a quick answer! I am in the U.S, so this is all super helpful. Just so I made sure I understand you correctly. I should look for a fulham workhose ballast that is 35W. Does that usually include an ignitor or is that a separate piece of gear I need to buy?

Also I appreciate the help with the cap! I’m going to see if I can find one in person just because I’m in a little bit of a time crunch.

I may have more questions but I will make sure to send pics once I get it all set up.

Some of our US members will be able to advise you correctly of which ballast to get, and which tappings to use. 

I found this that I thought might work

https://www.1000bulbs.com/product/2165/BF-WH33120CC.html?gad_source=1&gbraid=0AAAAAD_uQn7YI1jvygDIs4x3Qp1tOs-cN&gclid=CjwKCAjwl4yyBhAgEiwADSEjeHZ0gtR7yAfZpMSlaMwu9m1LYrFl6wZ8Fb_fD_37RRYATZz9R3wgmhoCDbAQAvD_BwE

Hi all,
I am new to this site and excited about it! I recently purchased three 26W Low Pressure Sodium Vapor Lamps. I'm a theater designer and am interested in using two of them in a show I have coming up in a few weeks. I am very new to the world of SOX lamps and am having trouble finding the correct Ballast for them. I was hoping to get an electronic ballast because they seem easier to find/cheaper and I don’t need an ignitor but am unsure which one to get. I know it needs to be at least 26Ws but can it be more than that? The system I’m running it on is 3 phase power, 120v, most bulbs we run on this system are 750w so I’m not really worried about getting power to it. Mostly just how to get it to actually work. I’m attaching a link to the bulbs below.

https://www.ebay.com/itm/186339138191

Also if someone knows what kind of base is required, It says it’s E26 but I’m not familiar with the bipin setup, do I need worry about the voltage since it is a different base then a typical E26?


Sorry for the long list of question
I appreciate any and all help!

Hello welcome to LG

the 26W SOX-E lamp has quite the wide current operating range 0.3A-0.6A thus the easiest method for you would be to use a standard F32T8 (or F96T8) 2 lamp instant electronic ballast, with the 2 outputs tied together should run the lamps within their rated current range, and by tie the outputs together, this is known as wiring the ballast for overdrive, this is where you take the 2 wires of the same colour and tie them together, they go to one lamp holder terminal, and the lone wire of a different colour goes to the other lamp holder terminal


the ballast you link to is not quite powerful enough to drive the lamps properly, but this ballast for example should work well https://www.1000bulbs.com/product/2178/BF-WH3120LC.html you will want to use the F48T8/HO wiring diagram for it https://www.fulham.com/WDpdf/wire3.pdf see here for other wiring diagrams if your curious https://www.fulham.com/contact-us/wiring-diagrams/


but it does not have to be a Fulham ballast, most sorts of US Instant start F32T8 2 lamp ballasts will work for the role, I mention this just incase you happen to already have something kicking around


I hope this helps