id go with T5s myself, MH put out way too much heat it can get outta hand quickly when the weather starts to get hotter. T5s put out the same light, better light spread, dont cost nearly as much to operate, longer lifespan when used 24/7, bulbs are way cheaper, and i mean WAY cheaper, plus the T5s have a much slimer design so its easier to work with, and no additional ballist to make noise and/or extra heat. also what happy head said, you can keep your T5s much much closer to your vegging plants then a MH which will give you more compact and vigirous growth since less light energy is lost from travel distance, MHs with their heat output, much more then an HPS, have to be further away to prevent light/heat burn. honestly all around T5s are better for Veg. unless you got a whole basement or warehouse with industrial ventilation and loads of room, MHs wont do more then T5s, except for additional headaches worrying and fiddling with heat issues. imo unless your large scale stick with T5s. sorry for the run on its kinda late and im a lil medicated XP but still this is what iv found through research around this site and friends who do both indoor/outdoor personal grows and large scale operations for medical patients and even still a few of my large scale friends still use T5s as primary lighting and the others use a mix of MH and T5s, its overkill if yah ask me considering both growers get the same veg results, one just has a much lower electric bill to worry about. hope this helps yah lean more towards T5s you wont be sorry using them.
