Lighting for reef tanks

A friend of mine who has had corals(don't know what kind) and apparantly
anemones had a 90 gallon tank and was selling off his equipment. He said
the light fixture was 48" and I knew that would fit my 55 gallon tank which
I plan to make a reef tank. So I assumed it would be at least 200 W or
better since he had a tank with anemones on 90 gallon.

When I looked at the light, it looked like the light that comes with tanks.
Just a regular 48" fixture with 2 flourescent bulbs (not compact, just the
regular type). One actnic and one regular both only 40 watts each.

Is it possible to have a reef tank in 55 gallon(let alone his 90 gallon)
with just 80W of regular flourescent bulbs?