Should I add another light. ?

[ChunkyBlenny14]

I have been running 4 Prime 16HDs on my 90g for a handful of months now. And I was wondering if it would be wise if I added one more light on there. I have an old LED unit from a past tank and thought about adding it to the middle and have the two primes on each side. The old LED is programming so I can take it slow. I just notice some shadows here in there and feel like the tank could be a bit brighter overall. All my sps are growing, some more than others. So I'm getting enough light I guess ? But feel they could grow faster. Anyone have luck with t-5 to supplement light? Or i could try 2 kessils on the ends of the tank?
Thanks.

 

[tzabor10]

Looks like you could add some of those new Reefbrite strips. It would look awesome.