Slipstream is right, the fluorescent paints are extremely bright, while the transparent paints are more like heavy-body acrylics with very little pigment.
That said, I've used Vallejo's transparent paint for glowing eyes and plasma, but unlike the painter in the video I do use a colored base with white only at the brightest.
Here's an example. The eyes are all a basecoat of Lime Green on the eye, a dot of white in the middle, and then a wash of 1:1:4 Transparent Yellow/Transparent Green/water, filling the eye socket and then wicking it away until I can just see the 'pupil'.