ok....tyYou can get by with that temp, but keep an eye on it, it can get hot fast! Yeah use the MH for veg, and HPS for flower, some people use their MH for the first 2 weeks of flower, they say it keeps the plant from stretching as much. As far as seeds go, I use a cheap T8 florescent light, the roots seem to like that light, I let them stay under the T8 till they are ready to be transplanted out of the germination tray.
ok....tyU
should try to get the temp downto around 75 if u can. And keep an eye on humidity, if it gets to high when you have nice dense buds you run into mold, and u cant smoke moldy bud. This is one of the reasons ventilation is so important.