I use regular garden lights. It is super easy to attach them to
stanchions. I make two loops of small stuff around the stanchion one
for the main shaft of the light and the other for the pointy bit to
make a simple bayonet mount. Works wonderfully and you can buy the
lights by the dozen at COSTCO. But, there is a guy on the dock with
the product you're looking at and it works well too.

-- Tom.