Originally Posted by e_murray
I want to upgrade mine as well, I have 4 t12 IceCaps. on a 100 gallon.
I cant decide on what to get... I was thinking T5HO's because I cant afford a chiller for the MH
.. and LED
's I would need to sell my arms and legs... LOL
So really.. how do you calculate how many watts per gallon? I have read 3 to 5 watts. so for my 100 gallon I would need 500 watts?
Right now I have a small pulsing xenia and a mushroom. They are doing fine, but I think I need better lights before I spend any money on sps
While the W/Gal
seems to be a rule of thumb for aquariums, I would like to point out that two similarly Watted bulbs can be very different in light output. Not only can color temperature change, but so can the raw light output (lumens). Even a 20W Fluorescent bulb can vary over 100 Lumens.
Wattage is nothing more than the measure of -energy drawn- by a lightbulb. While it's been a rather popular notion that the higher the wattage, the brighter the bulb, this isn't necessarily true. As technologies improve, bulbs have been able to provide more lumens per watt. (You may wish to google luminous efficacy.) Compare a T12 and a T5HO at the same wattage and you'll find that the lm/W is much higher for T5s.
When looking into fixtures, be sure to total the lumen count before you buy or you may find yourself with less raw light than you need and a hole burnt in your wallet...