are uv lights expensive to run?
If you have a 60 spotlight on for 14 hours at full power, and a 16W UV tube for 14 hours, the total power = 74. or 1.036kWh which is also 1.036 units of electricty. If electricity costs 12p per unit and you use 1.036 units per day then your running costs will be about 12p per day.