Ive seen it veg under hps and leds and without a doubt the metal halide led combo produced bigger plants through veg than hps did. Go ahead keep running your 250w hps and keep wondering why everythings stretching.
I mean just search how to grow marijuana and these questions will be answered theres hundreds of threads on here. Hps is for flowering not veg. So get a metal halide bulb that fits your fixture. Unless you like wasting your hard earned $$.
I noticed issues loading the website too.. sounds weird but it works flawlessly on wifi but will not load at all on data. And yes my data works fine.
Weird...