You are just growing over the summer so you really want one light for less hassle. As mattmao said, 400w hps would be ideal however they are costly.

Atm I am using a 125w hps for 6 plants and am having little progress. This is why I have purchased 6 15w CFLs that will boost veg and I can combine them with my HPS for flowering. For speedy veg get atleast 4 CFLs one for each plant, they are cheap so you will get profit if you come to sell etc. Plus they are small and easier to place/hide if worse comes to worse.

As for flowering you can try the CFLs (I haven't got that far so wouldn't know) or try maybe borrowing a lamp as it is only a single grow. I wouldn't suggest MH as people seem to give them negative feedback and don't suit flowering.

By the way i got busted by my parents and they are now helping me grow lmao.

Remember nutes!

I hope this helps and if you need help please ask i'll bookmark your thread!

*You can ignore me if you wish as i am a first time grower, but I can only help and I have got a lot of knowledge from this site + personal experience*