to much light?

I said he is fine but friend wants to,know your opinion. He has a 8x8x6.5 area and was,thinking 4 600s I think he would be fine but he worries it,may be overload

Well that comes out to 37.5 watts per square foot so he could probably add 1 or 2 more and be in a better range. 1 more would put him at 46w/sqft and 2 more would put him at 56w/sqft so he is perfectly fine.

He also has 2 300w leds

Adding those will put you in a more desirable range

Na, not too much light. Its just right. With the low ceiling your gonna have to keep em low though. (The plants not the lights)