I’ve got a couple of the Roleadro 400w cobs. For the money they do a pretty good job. They’re pretty inefficient, and only pull about 180watts. They’re good for about a 2’x2’ grow.
Of all the amazon lights I’ve bought they’re the best. Still, I can’t wholeheartedly recommend them because for just a little more a novice diy’er can build an eb lightstrip light that offers about the same light penetration with half the energy usage. DIY with bridgelux eb strips
I’m also rebuilding my roleadros with citizen 1212 cobs. Better light, half the energy, plus extra leftover drivers to build another light. https://ilgmforum.com/t/diy-tutorial-upgrading-the-roleadro-400w-cob/24031/12