That's not totally accurate.
Strains are hard to tell. Unless you know for sure what you're planting.

Once you get leaves. You'll be able to tell if it's Sativa or Indica.

If you're lucky. And you invest in good lighting. Your plants will be healthy. 100 watts isn't nearly enough for five plants.
A lot of variables come into play when you're growing indoors. Outside of nature's elements. Co2, lighting, humidity, light schedule. A lot of shit.
As for how much bud you get. That depends on how well you take care of the plants. And if they're male or female of course. Chances are, if you have five plants. They aren't all going to be female plants. And 4-6 ounces off of one indoor plant, from a first time grower, is a LONG shot. Realistically. As a first timer. You'll be lucky to get 1-2 ounces. Maybe less. Maybe more. Their yield depends on how well you take care of them. I would highly recommend investing in nicer lights. Go to Wal-Mart and invest in a shop light. With two 32" grow bulbs. And that is simply fine for lighting. The shop light is like 20 bucks. The bulbs are ten a piece.