If specs are accurate (1890umol/s PAR), then you can cover 23-24sq ft given ambient CO2 levels. This will be somwhere near max DLI for an at least loosely controlled environment.
You can double check the spec sheet by asking them for necessary informationa bout their light. How many diodes are there?
Since 95% of the diodes will likely be a samsung lm301 chip, you can do some rough math to check the integrity of their promises. If wats per diode is near 0.20 watts, that means they'll match the testing specs on samsung.com and "3.0umo/J" is possible with the best binning. Lowest quality chip per CCT might be 10-15% less efficient producing photons, but still good, too.
if the per diode wattage is .4-.5wattss, there's no way it's 3.0umol/J efficacy. the very best chips can stay up near 2.8-2.9 range, but their longevity will still be reduced from the advertised 50k hours.
fyi, the 50k hours is based on what is called "L90" in this context. This is how many hours it takes to dim to 90% of original intensity. TVs use an L50 for this, and you can guess the 50 stands for 50% of intensity. So, they can lie about this without technically lying. They all say 50k hours, but only the ones operating the diodes at the same testing parameters as on samsung.com will actually meet those expectations. Heat dissipation will also be important. Even with a good heat sink, you want a fan pointed at these LED lights, if you want to get the most years out of them.
should be able to find a high efficacy light for 1usd per watt. Maybe a bit more in the EU for various reasons. You pay for efficacy. Make sure the watts per diode are somewhere near testing specs on samsung.com and it's probablay good equipment.