You can tape a conventional glow stick to this bobber. But it is meant to house the LED/battery (1piece) in the screw off top dome. If you want to purchase replacement lights/batteries, they are a little hard to find on the website. Copy and paste this item number in the item search bar 38-444-049-00 . Here is the confusing part...you have to click on the only float listed that comes up from the search. Then scroll down to the last item. This is the replacement battery/LED. BUT.....this is only the RED replacement LED. I can get all three colors (red,green, yellow) at my local BPS store.