Lighting

Hi all, my current tank is 240 gallons and the size is 96 x 24 x24
I currently have 4 250 W MH 20K lights. and 4 T5 54W actinics.
however I do not get the really beautiful effect on some of the corals that I would like.
Marc has suggested I go with the 400W lights. Now after doing some research it has been suggested that I get better reflectors and maybe even some of the new Radium or Elos bulbs.
I understand that some of these new bulbs require electronic ballasts.
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