Some say MH could be better for flowering. I began growing indoors fairly recently. I wanted to grow organic. I got sold on the idea of flowering under metal halide only. The reason was to produce more resin. More uva(b?) and the plant protects itself with the thick coating of resin. Sacrifice a little yield for more potency. Sounds great for a personal grow. I now run HPS and MH side by side for flower. I do wanna do a HPS only flower. It's kinda funny that's what everyone does and I've never tried it. Interested if anyone else has flowered under just MH and what they thought about it?

Back to the thread sorry... My vote between the 2 is... A no brainier... No one veg's under HPS. Catbuds explained it well above.

The important part is flower. You could veg in a window, you can veg for a day. Some folks on here are popping sativa seeds and sending them straight to flower.

MH for veg.