Any question answered...

Also interested as I have the same lamp!

I may have got the answer to this on another forum:

thats a really curious lamp the GX23 13W PL-S lamp was a US only size of lamp, originally the PL-S line up was 5W 7W 9W 11W, but the problem with the 11W one is its arc voltage was too high to be run effiecently on 120V mains (would of required complex and lossy autotransformer ballasts)

so a 13W PL-S lamp was developed which can be thought of as a high current version of the 9W PL-S lamp, now the 5W-11W PL-S lamps all and ran at roughly the same current and where designed to be interchangeable with each other

image.thumb.png.ed95210604987cc1eb8fc84e7d59f2e2.png

but the 13W PL-S lamp on account of its higher lamp current was not interchangeable with any other lamp so was given a modified cap to stop the wrong lamp being installed
image.thumb.png.e21cf8a5b0bfab5f89a3f3eba5b3094c.png

note the double notches

as this 13W lamp was less efficient then the 11W PL lamp (they both where designed to target the same 850-900 lumens) it was never introduced, marketed or sold in any 220V-240V country

so I find it very curious that your handheld lamp claims to use these lamps! gawd knows where they expected you to get spare/replacement tubes from, 13W PL-S lamps just dont exist here!

I imagine such a portable light uses an inverter-electronic ballast, those generally are not compatible with LED retrofit tubes (and you would struggle to find a 13W PL-S type here in the UK anyhow)

so if your looking for an LED worklight, your best off just getting a whole new unit im afraid

This probably explains why I’ve struggled to even find a like-for-like replacement. I’ve had pretty good use out of this one though and it lasts a good 7+ hours on the 3AH batteries, so I shouldn’t feel too bad about replacing the whole thing when the tube dies.