Here’s the formula for calculating the kilowatt consuming by your appliance (true watts consumption)
The formula is : Number of hours of utilisation × Number of days ×( Number of watts have your lights ÷1000) example : 300 watts ÷ 1000 = 0.3 kilowatt. A schedule of 18/6 for 30 days gone a give :18×30×0.3= 162 kilowatt for 30 days. That’s gone a give you how much kilowatt your lamp or appliance are consuming in a definite time, just multiply by the rate of your local electricity distributor charging.
Hoping that’s gone a help as much as possible my fellow grower’s