
Like LUMINOUS fish.
The Big Bang Theory Season 1, Episode 4

Don't you worry about the residual radium
from the LUMINOUS dials?
The Big Bang Theory Season 2, Episode 1

I read an article about scientists
who inserted DNA from LUMINOUS jellyfish...
The Big Bang Theory Season 1, Episode 4

...LUMINOUS paint
will guide you to the nearest exit.
The Big Bang Theory Season 4, Episode 24

I was working with LUMINOUS fish
and I thought, "Hey...
The Big Bang Theory Season 1, Episode 4