What Optics?

[eli@fijireefrock.com]

Originally Posted by Jaws

The tank is going to be sps dominant. Are 90's going to be enough for a 30" deep tank?

Depending on the LEDS and the current they are driven at..as an example my tank is 31 deep and running DIYs 100 w led running at I believe 4 amps 2 feet from the water line with some 60 and 120 degree lenses no issues at all having SPS.

[Jaws]

They're Cree's running at 1A and 1.5 amps between the royal blue and whites.

[eli@fijireefrock.com]

You should be good as long as you have enough of them over your tank ...either way I wouldn't go with less angle as it will give you as some say the disco effect.