Ummm, Matey look at the Carvin in the original post AGAIN. It has FretFx on it. Look at the back of the headstock and you can see the battery box/control. Its a newer FretFx with the machined aluminum battery box. I was not referring to your SEI. I shold have stated I have never personally seen a fretless with LEDs. Seen them on the web etc.Eh?
The Carvin in the original post, and my Sei have built in LED's - not some crappy stick on rubberised jobs matey!!
I have had the LED's fitted as standard in most of my basses when I had them made.
As for the FretFx being crappy rubberized jobs they are actually pretty decent. I bought some for my guitarist last year for Christmas to put on his Gibson Les Paul. You can barely tell that they are stick on and are great when playing in a dark night club. Of course the ideal is to get a custom guitar made with LEDs. But for a quick add on they work great.