I bought the orbit marine pro LED 48", for my 75gallon about 2 months ago. Having good growth with my leather, Stylophora, chalice and frogspawn.
Zoas growing slow, Psammacora growing slow, Montipora growing slow.
In my opinion, the light angle is narrow, you need at least two of these units, maybe 3, for a 75 gallon tank.
With that being said, I'm not sure if adding another unit would be better, or if it would be better supplement with T5 lighting.
Any thoughts? I may buy two Kessil A360's or just buy the ATI 6 bulb T5HO fixture.
Current DT set-up, start date 10/5/15:
75 gallon, 75 lbs live rock
ph 8.2, SG 1.025, 0 ammonia and nitrite, trace nitrate
Mg ? Ca 450 Phosph ?
30 gallon sump/refugium w/ mix of macro algae (chaeto, caulerpa, red). Coralife skimmer (actually works well)
All RO/DI water from spectra life 90gpd unit.
20 gallon QT, start date 11/31/15:
SG 1.023, ph 8.2. 2lb live rock, no sand. HOB filter and small pump.
Fish in DT:
Kole Tang (12/15/15)
Starry Blenny (11/14/15)
2 Stubby Ocelaris (11/14/15)
Invertebrates in DT:
Skunk cleaner shrimp (12/13/15)
Fire Shrimp (11/28/15)
4 mixed snails
4 hermits (Cortez and blue leg)
Corals (all frags):
Leather toadstool
Birdsnest
Candy cane
Stylophora
Psammacora
Encrusting Montipora
Frogspawn
Chalice
Fish in QT:
Royal Gamma (12/13/15)
Six Line Wrasse (12/13/15)