Power glows. The more power, the more glow. So, anything that glows is automatically presumed to be superior to otherwise identical things that don't glow, and more glow is better. This is closely related to the Rule of Cool because glowing is cool, so things that glow automatically get more Willing Suspension of Disbelief, allowing them to be more unrealistically powerful. They're often Colour-Coded for Your Convenience, too. For example, evil glows bright red, good glows blue or gold, and radioactive materials glow green. Examples of Power Glows include: