Hello there, friends. I have a relatively small, and inexpensive grow. It's basically just to see if I could even manage doing it. Anyway, I have a choice between a 75 watt standard lightbulb, and a 15 watt helical spiral lightbulb. And I know, most people, given the choice, would choose neither, but It's what I'm limited to. So, which would do better for my babies?