I respectfully disagree with everyone who thinks people are captivated and stay to watch your band simply because of your musicianship. Sorry, unless you're a huge name, most people don't come into a bar to stare at and worship a bland band dressed in black just because you can hold a guitar. My humble opinion.
Having worked for Disneyland entertainment for years, their bands and stage shows were all about colors, lighting, movement, enthusiasm, smiles, audience participation and fun. Black lights, fluorescent costumes, the works.
Making music is a little part of what we do on stage; making a visual impact is the big other part. If these little lights contribute to that, more power to ya, bro.
Again - just my opine. You wanna wear black on a dark stage, knock yourself out.