These are a few of my old logo ideas. They are very messy and went through several changes.
The font is named "DS-Digital" and can be found here.
The rainbow I used wasn't vibrant enough. Too much blur was used to smooth out the edges.
Still, too much blur, the rainbow is slightly better.
A much clearer version, however the rainbow is washed out.
The final finished design for the logo. The rainbow flows perfectly with the logo and the text. The after glow took several tries to give a proper lighting effect. Finally, the edges are sharpened to give a retro LCD/LED segmented display style.