Not sure i should admit this ...
I built something like this a lot of years ago ... we're talking mid eighties ...
It switched 12v so could use decent size lamps rather than led's ...
I used lamps like in your interior light .. y'know, with a cap at each end.
It was only 10 or 12 channels though (i think - long time ago an' all that)
Also did a mains version but this was triggered by the i/o port on a pc.
Well, that's if a BBC micro counts as a pc
Did a proggy to sequence them any way you wanted ... or randomly.
Oh and piped hifi into the a->d port so could be sound synced too
Oh the joys of a mispent youth ...

I'm sure today i'd be doing drugs and mugging old dears instead.
Coz that's progress and human rights isn't it
Hmmm, now where did i put me pension book and bus pass