Fecida 600w ??

probably good for 2 ft^2. you have ove 4 ft^2. depending on shape of the light, 2 may be best for that size tent. otherwise, stick to one plant well-centered under it... maybe 2 smaller plants if it is rectangular in shape etc.. 40w per sq ft should be safe with a potentially slightly less efficient LED grow light. as a point of comparison, a top-end light that is much more expensive might be closer to 30-32w/sq ft for ambient atmospheric CO2 conditions. i'd suggest a different brand when you upgrade... the lights that highlight a false wattage in such a grotesque way is a bit of a red flag. (correlation)... Use it to learn... read up on terms like DLI, PPFD, PAR, umol/s of photons etc etc.. it's the only way to buy with confidence and not rely on marketing bullshit. ** this is based on photoperiods.. if autoflowers, you can cover 50% more space over 18 hours vs 12 and provide the necessary energy for the plant. it's proportional. so a 20/4 schedule will cover 75% more space. (12 * 1.75 = 20). i would suggest at least a 4-6 hours dark period except in extreme cases where the benefit might outweight potential cost (i.e. trying to stretch a light's coverage a bit too far). in a 60x60 tent, i wouldn't worry too much about getting the 'greatest' efficacy possible as the initial cost is not as easily recooperated by savings on monthly utility bill. in the smaller light options, i'd probably recommend viparspectra, though if in a market for the FC-series of lights from mars, it is a professional-grade light. don't think those come smaller than the fc-3000 which is top-notch light for a 3x3 area (photoperiods... again, suitable for larger area for autoflowers).

I really doubt that you'll get good results from your light is it purple if so then definitely not good enough I paid alot for new lights just after a failed 1st attempt with cheap purple leds and I have a marshydro tsl.2000w led pulling 300w and a maxibright 200w daylight led so 500w true and I flowering between 8 and 5 plants at a time different sizes happy growing but no dairy to refer to mybe considering making one if I can I'm sure you can to