Sorry but i have to...
7 P's - Prior Planning and Preparation Prevents Piss Poor Performance
Learn It, Live It, Love It !!!
Really... veg 16 plants with that one bulb? Did you plan to have a big wide reflector over that single bulb an hope that each plant gets its share(12.5watts) of the 200w?
If anything I think you would need 4 of those, each one over 4 plants so that they each get a bit more than... 13 watts(lol). Even 50 to me is inadequate. If ya wanted you could start a S.o.G/Scr.o.G or maybe LST all of them... since ya don't state how you are going to grow the individual plants then it is rather difficult to tell you a good way to place the bulb an its effective range. I'm not going to fish the info out of you! See why the "7 P's" work wonders