jdoenumber2,
There really is no difference between these items other than the manufacturers of the bulbs. You are also able to use the following bulbs for this application.
Coralife
Item# 14070 10000ºK
Item# 14071 50/50
Item# 14072 Actinic Blue
Found here: http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=13315
Current
Item# 21119 SunPaq Dual Daylight 6700ºK/10000ºK
Item# 21120 SunPaq Dual Daylight 10000ºK/Actinic 460nm
Item# 21121 SunPaq Dual Actinic 420/460nm
Found here: http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=13314
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Sincerely,
Joyce
LiveAquaria.com