Dual spectrum lights bulbs??

Hiya at the moment I am trying to decide on which light bulb to use and have come across dual spectrum lighting. I'm thinking of buying it with a cool tube.

http://www.greenshorticulture.co.uk/...-Light-786.asp
(400W GROWLUX)


Here is the lumen rating for the bulb in the cool tube
http://www.greenshorticulture.co.uk/...-Lamps-806.asp

Now I'm looking at this instead of buying blue and red and plugin it into my normal reflector but I would have to invest in a ballast if I go with the 2, not a problem.

http://www.greenshorticulture.co.uk/...-Lamps-807.asp

Sunmaster (NON VENTURE PACKAGING) 400W 7200k and can somone tell me what the difference between the MID bulbs are, what is (Venture packaging)??


http://www.greenshorticulture.co.uk/...-Lamps-808.asp

Son-T-plus 400w


As you can c I'm quite stuck lol so can someone break it down for me coz i really want the best for my plants plus i have two strains at a time so what i'm thinking is the dual spec so i can leave them all under one light instead of maybe 1 needing more veg. Thank for any help!
 
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