- igotatank wrote:
- okay. my tank is 18" 72" long. i also have to think about wattage to.
dont worry about wattage at all. the reason for this is that bulb types differ and when pet shops talk wattage they are wasting your time if you know anything about lighting, wattage is teh power the bulbs use not how much light they put out. ok lets look at this logically, no bulb is 100% energey efficient. if a bulb was 100% energey efficent it would give off no heat at all and be super bright, so lets compare a 150 watt mh bulb to a 54 watt T5HO bulb. they are different watts 150 Vs. 54, and LFS's claim you need MH lighting to keep corals well you dont, although teh T5 bulb (48" 54 watt) is only 54 watts you must remember that watts are not actual light output.
like i said before it is your tank, choose which lighting looks and works best for your application, in my case it is T5HO due to price and performance. if you go T5's you would need a 4 bulb setup on your tanks unless you go retrofit and them you may need more to stagger the bulbs but you can get 72" fixtures but i think they are 8 bulb setups which would definatley give full coverage of your tank.
if you have any other questions feel free to ask, i will help you if i can.