LEDs are simply more efficient.
They last longer and use less power to do the same job, all while being the cheaper option. Unlike UV tubes, they have no mercury or heavy metals present, and thus have a safer and easier disposal.
Additionally, standard UV tube products have to slow down the flow of water to maintain effectiveness, which causes build-up on the tube that must be regularly cleaned. The Oxy-Sal UV Powerhead sanitises water while maintaining your filtration system's natural water speed, greatly reducing build-up and thus reducing maintenance.
The Oxy-Sal UV LED Powerhead provides a 'set it and forget it' experience you just won't find with the short-lifespan, high-maintenance designs of UV tube sanitation systems.