Will 2 of these lights work?

[Jake_the_reefer]

So i am currently using this wattshine light on my 20g tank and it does an amazing job growing coral. I am upgrading to a 50g lowboy frag tank and I was wondering if 2 of these would work fine or if I would need more than 2 to effectively light the tank.

 

[Jake_the_reefer]

Forgot to add. The tank is 48×24×10