Currently using the 24" version of this light. Very good PAR values for the price. The power butting takes time to get used to. These lights are VERY waterproof - dunking them fully into your tank will not ruin them.
As for other considerations with your setup, a 4' long light on a 5' long tank will leave dark areas at the ends. A single light on a 24" wide tank will give you darker areas in the back or front. If you are growing lower light plants, this may be a good choice for a light.
As for other considerations with your setup, a 4' long light on a 5' long tank will leave dark areas at the ends. A single light on a 24" wide tank will give you darker areas in the back or front. If you are growing lower light plants, this may be a good choice for a light.