That's only ~414 watts for 36 ft.², or 11.5 watts per square foot (in metric terms, ~3.345 m² and 123.785 watts per m²). I hope you have additional light to go along with it, or don't mind significantly reducing your grow space. Otherwise, you should consider purchasing one or more of the more powerful models, IMHO. Current thinking seems to be to recommend 26-50 watts per square foot of LED light (a range is generally given due to the variance amongst LED products in terms of power output, intensity, penetration, design of reflectors/lenses, et cetera). And, of course, the light requirements vary between strains - the "average" indica doesn't need as much light as, for example, an equatorial sativa.
I guess it comes down to: Do you wish to grow some buds in your tent - or a tent full of buds, lol?
OtOH, if you are using the space you mentioned for vegetative growth only, that might be enough wattage/LEDs. People routinely use less wattage for such purposes (and do not try to pack their space with growth, when they know that they'll be moving the plants to a different space, where they can - and often do - stretch/grow 2x-3x during the first 40% of the flowering phase).
The above is my opinion - but some searching will most likely show that it is many others' opinion as well. I'm not saying, "Don't trust manufacturers' recommended footprint/coverage size." However, unless the product is being marketed specifically - and solely - for the growth and flowering of cannabis, I would suggest that you take such recommendations as general suggestions. Cannabis is quite a "light-hungry" plant, lol, and if a seller were to give specific recommendations in terms of that plant, a grower could end up destroying a different sort of crop (or at least wasting a good bit of electricity).