I recently was lucky enough to acquire a lovely  Stanley Clarke Series II and ever since then my other basses havent been played!
Maybe its something about the natural reserve of some of us in the UK, but I found the blue LEDs on the side of the neck were so bright they were both dazzling and embarrassingly ostentatious.
They dont have a dimmer pot, only a switch, so I decided to try to reduce the brightness. I found that a 100k resistor in series with the leds brings the brightness to exactly the right level (actually I used a 100k trimpot but ended up turning it all the way).
Just so you know theres an easy fix if you find those blinding lights a bit too up-front!

I have red LEDs on mine, and have thought the same from time to time....
ostentatious?  maybe to some, but not to me...

When I took delivery on Woody, my custom Further, I found the red side LEDs too bright for my taste.  I brought it back to the mothership and they quickly and painlessly installed a dimmer pot in the electronics cavity.  I adjusted it to the level I liked and have left it there ever since.  A quick and cheap mod.
 
Bill, tgo

I hardwired a 30K resistor to reduce LED brightness. Seems to work well, so you can either use a trimpot or try various resistor values anywhere from 10k to 100K. I'd say that is probably the range you' be looking at.