I know that they are dangerous (why do you think I use them

), and no I don’t think the average forum reader should try to install it ether...
But you are wrong about the replacement of tubing; the light is restricted to a double walled quart glass tube, the very nature of UVc makes the UVc react within the tube...
A 6 watt increase in the system won’t mater that much (in my cases about 4-5% more heat, but with my radiator that won’t make a different to the water temperature to the CPU...
Link to a 6W UVc light for £30.60 + Vat