Running HID lights on 240V (if available) will provide same wattage, but cut current load by half, (Ohm's law), also larger A/C window units run on 240V.
Most modern ballasts now are switchable 120/240 the only extra cost is 240V cable, if 240V power is available, really you just need 240V plug matching 240V socket in the wall.
The most important factor to be able to draw more current is the wire size and total capacity of main breaker panel. If the panel has extra capacity (modern 200A panels found in newer homes should) running gauge 12 or better gauge 10 wire from the box will allow to use 25 A breaker. Standard household wiring uses 14 gauge wire which limits safe current to about 1500 Watts. However central A/C, range, water heater, dryer etc. have dedicated 240V circuits using thicker wire gauge 10, 8 or even 6 for Central A/C unit which can draw 20A + at 240V, that,s about 5 kW of power just for AC !
Myself I use 240V dryer outlet for 240V " extra " mobile applications, ballast can be one of them, since dryer is not used much in my household.
But if you do not really understand electricity, specifically DC/AC theory and safety codes/loads, it is not recommended to play with it, it is like playing with fire and asking for disaster.
In my redneck county located in Police State cops recently busted serious underground grow operation, only cause improper and unsafe electrical installation caused house to burn down.
Imagine this, dig cave under the house, lots of work this was not a cellar, then lose house, everything and go to jail only cause of electrical overload causing fire.
Electricity can be deadly if not harnessed properly.