Use a PNG with a transparent background, choose a bright glow color like cyan or magenta, set the size to "Neon" (60px), and use a dark background to make the glow pop.
A glow surrounds the object evenly with a light, radiating effect (like a lightbulb). A shadow is offset in one direction and creates depth by simulating light casting.
Glows are most visible against dark backgrounds. Try using a black or dark colored background. Also, increase the intensity slider for a stronger effect.