Need help 400watt lamp 150 watt bulb?

ok so i know shit about bulbs obviously lol. My problem is i went out i bought a 400 watt mh sungrow 2 system. Problem is i didnt realize that using this 24/7 would make my bill go up 20 bucks a month. which will automatically get parents wondering. So my question is, is it possible to stick a 150watt mh bulb in there to cut my cost? will i fuck something up? if someone can explain to me whats up. also is it cool to stick a hps bulb in the system since for flowering since its a 400watt mh system? thanks!

running a hps in mh is bad.you can run a mh in a hps.The other way can cause the bulb to blow.

use CFLS for veg and then use the 400 watt for flowering then you will only be running it 12/12 and it shouldent be as bad

fuck off man really? so now i gotta go buy a whole new system for flowering? damn thats fucked i figured i could use an hps in there. the dude at the store was gunna sell me a hps bulb for it too so i figured it wouldnt be a problem.