Windows sill grow light stand

This is a window sill grow light stand for the 2ft T8 Barrina Grow Lights from amazon

https://www.amazon.com/gp/product/B07ZJLWXFR/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

The bases for the stand have a hollow space to be filled with something heavy to add stability to the stand.

I used a 7/8" dowel for this stand.