Injecting power / how many nodes per power source

[Bullet1986]

Hi all. 

I have a 5v 60amp power supply.

I have made a matrix which is running 693 nodes. 

I have injected power as required but I have used all 3 outlets on the power pack. But I'm happy with how the matrix looks. 

I have 2x 5mtr strips (I think totalling 500ish leds) and another 400 leds on top that I'll be using elsewhere in the display. 

How many lights will the current power source power? Do I need a second power source for the rest of the lights or can I just screw them into the outputs I have already? 

Thanks in advance