is a questionable measure of light intensity. If you had one of those tall 120 gal
tanks that are 3 feet tall, you'd certainly need more lights than a short and stubby 120 tank due to the lack of light penetration.
tanks are way taller than my 60, but you'd need more light than me to light the same corals, depending on the placement of the corals from the sand bed to the top-most rocks. Since that thing is nearly 2 feet tall, I would go with with something a bit more substantial than what you listed (more wattage).
What kind of corals do you want to keep? That would determine which lights to get. Budget? If you could afford MH
, I would go that route so you wouldn't have to upgrade later when you want to progress to harder corals that are more light demanding.
, let us know.