When I got my first array last year, you needed mucho real estate on the headstock to accomodate the Blue or green LED's, which used more juice than the red, (bigger battery pack). I just got my latest set, and Roz has started using a new battery pack that is smaller, and can accomodate Blue, Red or Green. So I ordered blue this time, just for variety, and I feel that the blues, overall, appear less bright than the reds. Still plenty visible, but if you are seeking something less noticeable to an audience you might consider going blue. Peace, JBY