“虹灯”不是常用的词，它可能是“霓虹灯”少写了一个字。

"虹灯" is not a common word; it might be a shortened form of "霓虹灯" missing one character.

如果你想说街上那种彩色的灯，正确的词是“霓虹灯”。

If you want to refer to the colorful lights on the street, the correct word is "霓虹灯".