I bought this Kessil A150W to add some light in the corners of my tank...but it doesn't have the output to penetrate my 30" deep tank (144 gallon circle). They say it is a 15k spectrum but it honestly looks way more actinic blue. Slick little led...just not enough juice to work on such a deep tank, it would probably be better suited on a much smaller tank. Google is your friend if you would like more details.
How about $100