Judging by their specs, it sounds like they are run at 2w and not 3w hence the 300w unit with 144 LEDs.
Probably undersized heat sink as with any of the chinese imported lights and internal power supply that will probably fail sooner then later due to heat.
i have one just like that its 120 watts im seeling it cause i ended up using my tank as fowlr and i have 2 units selling it cheap . if you wanna take a look lmk