Is it frowned upon to use an underpowered UV? I have a 15watt aqua ultraviolet setup on total water volume of 93g- model says it’s rated to sterilize 75g- After head pressure it’s gotta be running in the 200-300 gph range. What would cause someone to choose higher wattage? It kills more faster? Is my 15 watt still effective just killing less things slower? Lol.