How many watts?

[kdxracer]

When selecting lights, how do you decide on what wattage is necessary? A lot of videos i have seen using 150 watt lights have to adjust them down to only 30% output. Wouldn't it be better to use 100 watt lights instead?
I am looking to light a standard 75 gallon tank.

 

[Troylee]

Depends on depth of tank, corals, lens on the leds etc… tons of variables with that question… most of the higher wattage lights have better spread..

 

[kdxracer]

Would it be ok to mix? Have a 100 watt on one side and a 150 on the other to create a more desirable spot for a coral to choose from?

 

[Troylee]

Sure.. or get the same and adjust the voltage to your desired levels.. lots of ways to do it..