I've wondered about these lights myself. Other concerns to balance out what
@Glaucus said (great way to relay the understanding, BTW) include your grow space geography and intended usage, as well as how the measurements your reading about were taken.
That last one could be a long post on it's own, but sounds like it could play into what you're looking for.
If you're supplementing your window lighting for light hungry tree, this will be quite adequate in MOST cases, but it certainly won't do for the basement. If you're in a situation similar to mine where cost is a big factor, or a big light setup isn't much of an option, then this might be your best bet. DLI- Daily Light Interval- is also a factor. That's essentially how long you need to leave the light on to make up for lack of light efficiency. You can find apps for your phone to help you measure the light yourself.
I've had some decent success with similar lights in certain situations. I have 1 1/2 (one of them half the LEDs have failed) Sansi 15 watt lights like that on my herb pot above my kitchen sink at around 6" and those are doing well. I have two of the Sansi 32 watt lights (more comparable to yours) in my north facing living room window for the bay, pepper, and gardenias. It's not enough for the bay tree, but better than nothing.
At work, with my students, we successfully rooted and have maintained bougainvillea and Barbados cherry with a couple lights half of that, and my Benji's are thriving with it, though growing slower than they could.
I can get pics if you need.
Short hand, if you have to get more than two for a given space, you might be better off ordering something bigger, but if you only need a single light for a plant that can live in relative shade, this should do.
Keep your receipt, and give it a go. Let us know.