Average crop plant absorptance spectral range is between 400nm and 700nm, I recommend that you consult before buying lamps Product Manuals & Documentation.
An example you can see below site.
http://www.google.ca/url?sa=t&rct=j&...98197061,d.aWw
Or look at Product Manuals & Documentation in this site.
AquaticLife 48 Inch 54W Roseate T5HO Fluorescent Bulb
etc.
And to not wasting your time, look at spectral distribution graphics.
---------- Post added at 07:43 AM ---------- Previous post was at 07:24 AM ----------
I 've given you just two examples but any respectable company must submit this information.