Okay, again... I am not trying to be an a-hole, but please realize you are talking to probably the most informed group of LED lighting people on the planet on this forum (I am not including myself as being the best since I am no pioneer here). Seriously, RIU led guys as a group are very, very knowledgeable. You are regurgitating the sales pitch from the blurple manufacturers. Read, listen, read, and you will learn a lot -- like we all have. You can build a light that is almost twice as efficient as what you have there for just a little more $ than you have invested in your lights.
Here is a good thread to cut your teeth with on current led lighting.
https://www.rollitup.org/t/recommend-300-budget-light-for-a-friend.974539/
Also, your 2 lights will perform very well in a 2x4 growing area. The reliability may be questionable, but 480 watts over 8 square feet is a lot of light! You may need to raise or dim them. HID rule of thumb is 50 watts per square foot, new era led quantum boards, cobs, and strips you want about 30 watts per square foot of TRUE watts not imaginary "equivalent" wattage. The efficiency of your lights are about the same as HID. There is also nothing wrong with HID lighting either - it has been used to grow shit tons of great weed!