I have always used a twist PC light to grow chaeto. But brs put out a pretty good video showing the difference of quality and quantity of chaeto growth between each type of light. They all grow it, but with the limited space I wanted to have as much nutrient export as possible without spending 250 bucks on a kessil.
I got my light on amazon.
KINGBO Gooseneck Clamp Clip... https://www.amazon.com/dp/B072N2TBMN?ref=ppx_pop_mob_ap_share
150W LED Grow Light Blub Full... https://www.amazon.com/dp/B07J6B3J4R?ref=ppx_pop_mob_ap_share
Yeah I watched that, but I'm with you forget spending that much on a chaeto light. Although.. I had a strip light for $20, my current one for probably $30ish, so if I decide to get this combo I'm almost there in spending kessil fuge money! :eek: