Or you can go at any hydroponics store and buy a used hps kit(~100$), most place will sell you used equipement if you ask them. Use it 18/6 for veg and 12/12 for flowering. Hps bulb are not the best for veg cycle, but you will barely notice the difference. Commercial growers never take the time to switch to mh for veg and hps for flowering. they just use the hps lights all the way.