Unless I'm reading this wrong...you have 30W LEDs but want to drive them with a 50W amplifier but not blow them? 30W LEDs will by definition blow if you run more power through them. Not sure where this 50W specification came from, but if you want a 50W per LED light show you need 50W LEDs.

30W LEDs x50 is 1500W. That is the same power as a toaster and is already pushing most wall outlets.So it's pushing even a wall outlet. A laptop battery certainly won't power a toaster for any length of time, particularily without exploding and setting on fire. Let's also not forget you have to convert the wall power for your LEDs and that isn't a 100% efficient process so you will actually get less than 1500W. So you would need a power supply rated for that much AND a wall outlet that can provide more than that (which for all intents and purposes, doesn't exist for you). At 50W per LED...forget about it unless you have some other power source.

I'm not sure you can even find computer power supplies much more than 1000W in the first place.

It's probably not smart to run LEDs at their max power anyways...but I don't mess around with fancy LEDs a lot so maybe they are rated more conservatively than I think they are.