yes, get some spiral floro they work well, I'd lower the light too, not sure what an r14 is, but 6-7 inches seems pretty far away. also get a reflector for the fixture you're using, that'll help too.
an inch and a half tall may be fine (little on the tall side, but fine) you just need to worry about stretching as it grows from here on out, so drop the lights some, get more lights.