I dont know your tank dimensions, but you most probably dont need all 4 on for 4 hours. It will probably be overkill and give you more algae issues, unles of course you can maintain co2 and nutrients in excess. It is generally easier to make light the limiting factor as it is the easiest aspect to control.
I have a similar situation where I have 4x 54 w except two lots as my tank is 8 ft long. I do use Plant pro on half the lights and keep these on for 8 hours. I do use all 4 lights for 1 hour at night, but that is only really for a viewing period where i use Osrams with a whiter appearance plus the plant pros. Also my tanks is screened some what with floating plants. I would think that since plant pro combine aspects of the Original your current lighting might look quite pinkish. A 10,000 k marine white would help to balance it out. Personally I would replace both the originals, but this is all entirely down to personal taste. The current lighting is fine for growing plants.