Low wattage SOX

Discussion related to street lighting luminaires and components.
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Jack_T
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Re: Low wattage SOX

Postby Jack_T » Tue Jul 26, 2011 10:06 pm

Amtrakuk wrote:I've looked on ebay for a 35 watt SOX bulb, but they seemed to be few and far between but there seems to be a lot more 36 watt. Have/are 35 watt bulbs become obsolete?

Don't think so, doesn't some street lighting use them? I couldn't find any 135w SOX on Ebay but they're still made. Maybe it's the same thing with 35w!

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Tom
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Re: Low wattage SOX

Postby Tom » Wed Jul 27, 2011 8:10 am

I believe your 36w SOX is the SOX-E (economy) replacement for the 55w SOX. The 26w SOX-E replaces 35w lamps. SOX-Es are designed to run on existing gear but I don't see why there should be any problems in getting a proper 35w lamp as, like Jack said,these are still widely used and made! :D
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Danny
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Re: Low wattage SOX

Postby Danny » Thu Jul 28, 2011 11:45 pm

The 36Watt performs better on Electronic gear so ive been told, but also runs fine on 55W gear, They are more expensive.

personally i think its just a 55W with 36W stamped on it to make money! same with the 26W its just a 35W

35W rarely comes up on ebay, but theres always 18W 55W 90W 135W and 180W even seen a 10W SOX on there!

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Re: Low wattage SOX

Postby SuperSix » Sat Jul 30, 2011 3:45 pm

There's a big difference between the SOX and SOX-E lamps and that's the infrared reflective coating. The SOX-E lamps reflect a lot more infrared (heat radiation) back info the arc tube. Low pressure sodium lamps operate more efficiently with a lower current loading but the arc tube has to be kept up to temperature to keep the sodium vapourised. With standard SOX lamps if you reduce the loading below what they're rated to run at the sodium reverts back to a liquid form and the neon gas filling begins to take over as the primary discharge so efficacy falls dramatically.

The SOX-E lamps have better thermal insulation so they can be run at a lower current loading and achieve higher efficacy. The increase in efficacy can only be achieved when they're run at the lower current rating so on existing 35W, 55W, 90W, 135W and 180W gear there is no benefit when using SOX-E lamps.

There's is magnetic gear around to run SOX-E lamps at their lower current rating, it's just not common.

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Re: Low wattage SOX

Postby Jack_T » Sat Jul 30, 2011 5:10 pm

Eliot, you are clever! I didn't know that! Thanks.

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Re: Low wattage SOX

Postby Danny » Sat Jul 30, 2011 8:13 pm

I didnt know that either, Cheers eliot!

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Re: Low wattage SOX

Postby Jack_T » Sat Jul 30, 2011 9:08 pm

I've learnt a lot from Eliot and this forum!

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Re: Low wattage SOX

Postby neosodium » Sun Feb 10, 2013 6:33 pm

Couldn't you just use 35w gear to run a 36w SOX lamp in a 55w lantern?

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Re: Low wattage SOX

Postby LinearSLI-H » Sun Feb 10, 2013 9:03 pm

Not really, as a 36watt SOX is the same size as a 55, so although the wattage is similar, the discharge distance and current are different to a 35watt.
You can however, use 35watt gear to run a 26watt lamp in a 55 watt lantern. :roll:
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