I use these from Barrina.

https://www.amazon.com/dp/B0BKPF8D8G/?coliid=I2NU7X8ZG8B0VZ&colid=2DAUDXT01XYT7&psc=1&ref_=lv_ov_lig_dp_it&th=1

They are pretty reasonable in price, work well, and they're modular, which is great when configuring in odd sized shelves. I have used mine for over a year, and I'm buying some more for an additional grow space.