Okay need some advice, a mate of mine just gave me metal halide lighting to use on the tank

..
He used to grow tomatoes with it .......lol.
its got a 400w bulb .(sun bulb?? 14000k
im thinking that a 150watt will be suffient ?
if i got a 150w bulb what type should i get.. caution stupid question coming!!
is there a bulb out there that mixes actinic and sunlight in the one bulb ?...
or can i add a 10000k or 20000k actinic n/o with it .... tell me if im dreaming
im planning on making a hood for it as well ...
can someone put me on the right track please
cheers
matt