I find the LED glowsticks can be a bit bright and harm night vision, but they do make you pretty visible at night. I use Sylvania ones that I got at the dollar store (same place I get my chemical glowsticks).
Did a lot of night paddles this past season and putting glow sticks on the bow and stern of each boat was really invaluable...maybe not for visibility to speedboats but it helped the group keep track of where each other was on the water.
Touring Kayak Paddles
Wabakimi Canoe Pack
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