Last grow, I used fluro for like 2/3 weeks old then used the HPS for a further 5 weeks with no problems. Although thinking about it now the nodes were pretty far apart.... The only fluro I got is 1 crappy one and I broke the fitting, not the bulb. I moved the plants last night figuring the distance was a problem. They aren't a foot away but they are less than 2. Hopefully that's the problem solved. Fortunately I always spread my seeds over a few days that way, I minimize the damage and only stress 1 or 2 plants out before I figure the problem out.
<edit>I always thought it was MH for flower and HPS for veg. What a dumbo!<edit>
Thanks guys