They have breakers we call them piggy back breaker (120 volt)it’s two breakers in one they work nice I have a few in my garage. Run 12/2 wire it have some one do that for you if your not comfortable. I run all my hps 1000 watters on 240 volts pulls half the amps. Two 1000 watt hps at 240 volts draws 8.3 amps 
You can replace some 120 volt breakers with piggy back breakers then that frees up your box spaces for a regular 240volt breaker only need 12/2 romex…my whole grow building almost is 12/2 except the 30 amp wire ran for light controllers which was 12/3 romex
Note: if not comfy with electric have a professional do it 
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